78117852 has 12 divisors (see below), whose sum is σ = 182275016. Its totient is φ = 26039280.

The previous prime is 78117817. The next prime is 78117859. The reversal of 78117852 is 25871187.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×78117852² = 12204797602187808, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78117852.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78117859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3254899 + ... + 3254922.

Almost surely, 2^78117852 is an apocalyptic number.

It is an amenable number.

78117852 is an abundant number, since it is smaller than the sum of its proper divisors (104157164).

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

78117852 is a wasteful number, since it uses less digits than its factorization.

78117852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6509828 (or 6509826 counting only the distinct ones).

The product of its digits is 31360, while the sum is 39.

The square root of 78117852 is about 8838.4304036407. The cubic root of 78117852 is about 427.4809485029.

The spelling of 78117852 in words is "seventy-eight million, one hundred seventeen thousand, eight hundred fifty-two".