720787728 has 20 divisors (see below), whose sum is σ = 1862035088. Its totient is φ = 240262560.

The previous prime is 720787703. The next prime is 720787763. The reversal of 720787728 is 827787027.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 15016411 = 720787728 / (7 + 2 + 0 + 7 + 8 + 7 + 7 + 2 + 8).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7508158 + ... + 7508253.

Almost surely, 2^720787728 is an apocalyptic number.

It is an amenable number.

720787728 is an abundant number, since it is smaller than the sum of its proper divisors (1141247360).

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

720787728 is a wasteful number, since it uses less digits than its factorization.

720787728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15016422 (or 15016416 counting only the distinct ones).

The product of its (nonzero) digits is 614656, while the sum is 48.

The square root of 720787728 is about 26847.4901620245. The cubic root of 720787728 is about 896.6076938838.

The spelling of 720787728 in words is "seven hundred twenty million, seven hundred eighty-seven thousand, seven hundred twenty-eight".