78112780 has 24 divisors (see below), whose sum is σ = 166350240. Its totient is φ = 30804480.

The previous prime is 78112763. The next prime is 78112789. The reversal of 78112780 is 8721187.

It is a super-2 number, since 2×78112780² = 12203212798656800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (78112789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26085 + ... + 28924.

It is an arithmetic number, because the mean of its divisors is an integer number (6931260).

Almost surely, 2^78112780 is an apocalyptic number.

It is an amenable number.

78112780 is an abundant number, since it is smaller than the sum of its proper divisors (88237460).

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

78112780 is a wasteful number, since it uses less digits than its factorization.

78112780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55089 (or 55087 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 34.

The square root of 78112780 is about 8838.1434702091. The cubic root of 78112780 is about 427.4716965405.

The spelling of 78112780 in words is "seventy-eight million, one hundred twelve thousand, seven hundred eighty".