728771072 has 20 divisors (see below), whose sum is σ = 1456119786. Its totient is φ = 364385280.

The previous prime is 728771059. The next prime is 728771083. The reversal of 728771072 is 270177827.

It can be written as a sum of positive squares in only one way, i.e., 407070976 + 321700096 = 20176^2 + 17936^2 .

It is a super-2 number, since 2×728771072² = 1062214550768058368, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 711179 + ... + 712202.

Almost surely, 2^728771072 is an apocalyptic number.

It is an amenable number.

728771072 is a deficient number, since it is larger than the sum of its proper divisors (727348714).

728771072 is an equidigital number, since it uses as much as digits as its factorization.

728771072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1423399 (or 1423383 counting only the distinct ones).

The product of its (nonzero) digits is 76832, while the sum is 41.

The square root of 728771072 is about 26995.7602597149. The cubic root of 728771072 is about 899.9057810833.

The spelling of 728771072 in words is "seven hundred twenty-eight million, seven hundred seventy-one thousand, seventy-two".