78155970 has 32 divisors (see below), whose sum is σ = 198609408. Its totient is φ = 19615488.

The previous prime is 78155941. The next prime is 78155993. The reversal of 78155970 is 7955187.

It is a super-2 number, since 2×78155970² = 12216711293281800, which contains 22 as substring.

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, 76114 + ... + 77133.

It is an arithmetic number, because the mean of its divisors is an integer number (6206544).

Almost surely, 2^78155970 is an apocalyptic number.

78155970 is an abundant number, since it is smaller than the sum of its proper divisors (120453438).

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

78155970 is a wasteful number, since it uses less digits than its factorization.

78155970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153274.

The product of its (nonzero) digits is 88200, while the sum is 42.

The square root of 78155970 is about 8840.5865190043. The cubic root of 78155970 is about 427.5504676919.

The spelling of 78155970 in words is "seventy-eight million, one hundred fifty-five thousand, nine hundred seventy".