78543904 has 24 divisors (see below), whose sum is σ = 155209068. Its totient is φ = 39125760.

The previous prime is 78543901. The next prime is 78543911. The reversal of 78543904 is 40934587.

It can be written as a sum of positive squares in 2 ways, for example, as 76527504 + 2016400 = 8748^2 + 1420^2 .

It is a super-2 number, since 2×78543904² = 12338289711122432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78543901) 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, 4434 + ... + 13294.

Almost surely, 2^78543904 is an apocalyptic number.

It is an amenable number.

78543904 is a deficient number, since it is larger than the sum of its proper divisors (76665164).

78543904 is a wasteful number, since it uses less digits than its factorization.

78543904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9148 (or 9140 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 78543904 is about 8862.4998730606. The cubic root of 78543904 is about 428.2566952303.

The spelling of 78543904 in words is "seventy-eight million, five hundred forty-three thousand, nine hundred four".