78187812 has 24 divisors (see below), whose sum is σ = 192040800. Its totient is φ = 24690816.

The previous prime is 78187783. The next prime is 78187817. The reversal of 78187812 is 21878187.

It is a super-2 number, since 2×78187812² = 12226667890694688, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (78187817) 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, 171237 + ... + 171692.

It is an arithmetic number, because the mean of its divisors is an integer number (8001700).

Almost surely, 2^78187812 is an apocalyptic number.

It is an amenable number.

78187812 is an abundant number, since it is smaller than the sum of its proper divisors (113852988).

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

78187812 is a wasteful number, since it uses less digits than its factorization.

78187812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342955 (or 342953 counting only the distinct ones).

The product of its digits is 50176, while the sum is 42.

The square root of 78187812 is about 8842.3872342258. The cubic root of 78187812 is about 427.6085234555.

The spelling of 78187812 in words is "seventy-eight million, one hundred eighty-seven thousand, eight hundred twelve".