78115860 has 48 divisors (see below), whose sum is σ = 243028800. Its totient is φ = 20830752.

The previous prime is 78115853. The next prime is 78115861. The reversal of 78115860 is 6851187.

78115860 is a `hidden beast` number, since 78 + 1 + 1 + 586 + 0 = 666.

It is a super-2 number, since 2×78115860² = 12204175167079200, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78115861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71790 + ... + 72869.

It is an arithmetic number, because the mean of its divisors is an integer number (5063100).

Almost surely, 2^78115860 is an apocalyptic number.

It is an amenable number.

78115860 is an abundant number, since it is smaller than the sum of its proper divisors (164912940).

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

78115860 is a wasteful number, since it uses less digits than its factorization.

78115860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144677 (or 144669 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 36.

The square root of 78115860 is about 8838.3177132303. The cubic root of 78115860 is about 427.4773148935.

It can be divided in two parts, 781 and 15860, that added together give a square (16641 = 129²).

The spelling of 78115860 in words is "seventy-eight million, one hundred fifteen thousand, eight hundred sixty".