78404236 has 12 divisors (see below), whose sum is σ = 137382280. Its totient is φ = 39152160.

The previous prime is 78404233. The next prime is 78404243. The reversal of 78404236 is 63240487.

It is a super-2 number, since 2×78404236² = 12294448445487392, 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 (78404231) 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, 8841 + ... + 15328.

Almost surely, 2^78404236 is an apocalyptic number.

It is an amenable number.

78404236 is a deficient number, since it is larger than the sum of its proper divisors (58978044).

78404236 is a wasteful number, since it uses less digits than its factorization.

78404236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24984 (or 24982 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 78404236 is about 8854.6166489578. The cubic root of 78404236 is about 428.0027003644.

The spelling of 78404236 in words is "seventy-eight million, four hundred four thousand, two hundred thirty-six".