78245904 has 40 divisors (see below), whose sum is σ = 220512672. Its totient is φ = 23710720.

The previous prime is 78245903. The next prime is 78245957. The reversal of 78245904 is 40954287.

It is a super-2 number, since 2×78245904² = 12244842985554432, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (78245903) 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, 73569 + ... + 74624.

Almost surely, 2^78245904 is an apocalyptic number.

It is an amenable number.

78245904 is an abundant number, since it is smaller than the sum of its proper divisors (142266768).

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

78245904 is a wasteful number, since it uses less digits than its factorization.

78245904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148215 (or 148209 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 78245904 is about 8845.6714838389. The cubic root of 78245904 is about 427.7143988011.

The spelling of 78245904 in words is "seventy-eight million, two hundred forty-five thousand, nine hundred four".