78366920 has 16 divisors (see below), whose sum is σ = 176325660. Its totient is φ = 31346752.

The previous prime is 78366919. The next prime is 78366929. The reversal of 78366920 is 2966387.

It can be written as a sum of positive squares in 2 ways, for example, as 69522244 + 8844676 = 8338^2 + 2974^2 .

It is a super-2 number, since 2×78366920² = 12282748300572800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78366929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 979547 + ... + 979626.

Almost surely, 2^78366920 is an apocalyptic number.

It is an amenable number.

78366920 is an abundant number, since it is smaller than the sum of its proper divisors (97958740).

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

78366920 is a wasteful number, since it uses less digits than its factorization.

78366920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1959184 (or 1959180 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 78366920 is about 8852.5092487949. The cubic root of 78366920 is about 427.9347878634.

The spelling of 78366920 in words is "seventy-eight million, three hundred sixty-six thousand, nine hundred twenty".