117521928 has 40 divisors (see below), whose sum is σ = 329172030. Its totient is φ = 39173760.

The previous prime is 117521917. The next prime is 117521933. The reversal of 117521928 is 829125711.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 117029124 + 492804 = 10818^2 + 702^2 .

It is a super-2 number, since 2×117521928² = 27622807121674368, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 117521892 and 117521901.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 90033 + ... + 91328.

Almost surely, 2^117521928 is an apocalyptic number.

117521928 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

117521928 is an abundant number, since it is smaller than the sum of its proper divisors (211650102).

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

117521928 is a wasteful number, since it uses less digits than its factorization.

117521928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181379 (or 181366 counting only the distinct ones).

The product of its digits is 10080, while the sum is 36.

The square root of 117521928 is about 10840.7531103701. The cubic root of 117521928 is about 489.8235210643.

The spelling of 117521928 in words is "one hundred seventeen million, five hundred twenty-one thousand, nine hundred twenty-eight".