720636400 has 60 divisors (see below), whose sum is σ = 1888734024. Its totient is φ = 262048000.

The previous prime is 720636379. The next prime is 720636407. The reversal of 720636400 is 4636027.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720636407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77491 + ... + 86290.

Almost surely, 2^720636400 is an apocalyptic number.

It is an amenable number.

720636400 is an abundant number, since it is smaller than the sum of its proper divisors (1168097624).

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

720636400 is a wasteful number, since it uses less digits than its factorization.

720636400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163810 (or 163799 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 720636400 is about 26844.6717245713. The cubic root of 720636400 is about 896.5449424706.

The spelling of 720636400 in words is "seven hundred twenty million, six hundred thirty-six thousand, four hundred".