728156816 has 20 divisors (see below), whose sum is σ = 1472143872. Its totient is φ = 348248736.

The previous prime is 728156809. The next prime is 728156831. The reversal of 728156816 is 618651827.

It is a happy number.

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, 988976 + ... + 989711.

Almost surely, 2^728156816 is an apocalyptic number.

It is an amenable number.

728156816 is an abundant number, since it is smaller than the sum of its proper divisors (743987056).

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

728156816 is a wasteful number, since it uses less digits than its factorization.

728156816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1978718 (or 1978712 counting only the distinct ones).

The product of its digits is 161280, while the sum is 44.

The square root of 728156816 is about 26984.3809638094. The cubic root of 728156816 is about 899.6528768340.

The spelling of 728156816 in words is "seven hundred twenty-eight million, one hundred fifty-six thousand, eight hundred sixteen".