78204636 has 24 divisors (see below), whose sum is σ = 202753040. Its totient is φ = 26068176.

The previous prime is 78204631. The next prime is 78204653. The reversal of 78204636 is 63640287.

It is a super-2 number, since 2×78204636² = 12231930183784992, which contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 78204636.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78204631) 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, 361951 + ... + 362166.

Almost surely, 2^78204636 is an apocalyptic number.

It is an amenable number.

78204636 is an abundant number, since it is smaller than the sum of its proper divisors (124548404).

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

78204636 is a wasteful number, since it uses less digits than its factorization.

78204636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724130 (or 724122 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 78204636 is about 8843.3385098615. The cubic root of 78204636 is about 427.6391913634.

The spelling of 78204636 in words is "seventy-eight million, two hundred four thousand, six hundred thirty-six".