720745388 has 24 divisors (see below), whose sum is σ = 1435795200. Its totient is φ = 313367120.

The previous prime is 720745343. The next prime is 720745391. The reversal of 720745388 is 883547027.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 355088 + ... + 357111.

It is an arithmetic number, because the mean of its divisors is an integer number (59824800).

Almost surely, 2^720745388 is an apocalyptic number.

It is an amenable number.

720745388 is a deficient number, since it is larger than the sum of its proper divisors (715049812).

720745388 is a wasteful number, since it uses less digits than its factorization.

720745388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712237 (or 712235 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 44.

The square root of 720745388 is about 26846.7016223595. The cubic root of 720745388 is about 896.5901375763.

The spelling of 720745388 in words is "seven hundred twenty million, seven hundred forty-five thousand, three hundred eighty-eight".