[go: up one dir, main page]

Search a number
-
+
28388772 = 2233436113
BaseRepresentation
bin110110001001…
…0110110100100
31222102022002000
41230102312210
524231420042
62452245300
7463205046
oct154226644
958368060
1028388772
111502a9a5
129610830
135b5c7b9
143aada96
15275b74c
hex1b12da4

28388772 has 48 divisors (see below), whose sum is σ = 75324480. Its totient is φ = 9241344.

The previous prime is 28388741. The next prime is 28388791. The reversal of 28388772 is 27788382.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1588 + ... + 7700.

It is an arithmetic number, because the mean of its divisors is an integer number (1569260).

Almost surely, 228388772 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28388772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37662240).

28388772 is an abundant number, since it is smaller than the sum of its proper divisors (46935708).

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

28388772 is a wasteful number, since it uses less digits than its factorization.

28388772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6169 (or 6161 counting only the distinct ones).

The product of its digits is 301056, while the sum is 45.

The square root of 28388772 is about 5328.1114853201. Note that the first 3 decimals coincide. The cubic root of 28388772 is about 305.0578480260.

The spelling of 28388772 in words is "twenty-eight million, three hundred eighty-eight thousand, seven hundred seventy-two".

Divisors: 1 2 3 4 6 9 12 18 27 36 43 54 86 108 129 172 258 387 516 774 1161 1548 2322 4644 6113 12226 18339 24452 36678 55017 73356 110034 165051 220068 262859 330102 525718 660204 788577 1051436 1577154 2365731 3154308 4731462 7097193 9462924 14194386 28388772