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28068311 = 377431021
BaseRepresentation
bin110101100010…
…0100111010111
31221211000111002
41223010213113
524141141221
62441333515
7460401545
oct153044727
957730432
1028068311
1114931157
12949729b
135a7998b
143a28d95
1526e680b
hex1ac49d7

28068311 has 8 divisors (see below), whose sum is σ = 28893984. Its totient is φ = 27246240.

The previous prime is 28068307. The next prime is 28068319. The reversal of 28068311 is 11386082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28068311 - 22 = 28068307 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28068319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26981 + ... + 28001.

It is an arithmetic number, because the mean of its divisors is an integer number (3611748).

Almost surely, 228068311 is an apocalyptic number.

28068311 is a deficient number, since it is larger than the sum of its proper divisors (825673).

28068311 is a wasteful number, since it uses less digits than its factorization.

28068311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1801.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 28068311 is about 5297.9534728044. The cubic root of 28068311 is about 303.9056400067.

The spelling of 28068311 in words is "twenty-eight million, sixty-eight thousand, three hundred eleven".

Divisors: 1 37 743 1021 27491 37777 758603 28068311