78361812 has 36 divisors (see below), whose sum is σ = 198374176. Its totient is φ = 26082000.

The previous prime is 78361807. The next prime is 78361847. The reversal of 78361812 is 21816387.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×78361812² = 12281147159846688, which contains 22 as substring.

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

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33687 + ... + 35937.

Almost surely, 2^78361812 is an apocalyptic number.

It is an amenable number.

78361812 is an abundant number, since it is smaller than the sum of its proper divisors (120012364).

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

78361812 is a wasteful number, since it uses less digits than its factorization.

78361812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3228 (or 3223 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 78361812 is about 8852.2207383232. The cubic root of 78361812 is about 427.9254899845.

The spelling of 78361812 in words is "seventy-eight million, three hundred sixty-one thousand, eight hundred twelve".