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28054278 = 2327534201
BaseRepresentation
bin110101100000…
…1001100000110
31221210022020100
41223001030012
524140214103
62441144530
7460312620
oct153011406
957708210
1028054278
111492165a
12948b146
135a73485
143a23c10
1526e25a3
hex1ac1306

28054278 has 48 divisors (see below), whose sum is σ = 70795296. Its totient is φ = 7862400.

The previous prime is 28054277. The next prime is 28054303. The reversal of 28054278 is 87245082.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28054277) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4578 + ... + 8778.

It is an arithmetic number, because the mean of its divisors is an integer number (1474902).

Almost surely, 228054278 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28054278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35397648).

28054278 is an abundant number, since it is smaller than the sum of its proper divisors (42741018).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28054278 is a wasteful number, since it uses less digits than its factorization.

28054278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4269 (or 4266 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 28054278 is about 5296.6289279125. The cubic root of 28054278 is about 303.8549847942.

The spelling of 28054278 in words is "twenty-eight million, fifty-four thousand, two hundred seventy-eight".

Divisors: 1 2 3 6 7 9 14 18 21 42 53 63 106 126 159 318 371 477 742 954 1113 2226 3339 4201 6678 8402 12603 25206 29407 37809 58814 75618 88221 176442 222653 264663 445306 529326 667959 1335918 1558571 2003877 3117142 4007754 4675713 9351426 14027139 28054278