728626556 has 12 divisors (see below), whose sum is σ = 1457253168. Its totient is φ = 312268512.

The previous prime is 728626519. The next prime is 728626597. The reversal of 728626556 is 655626827.

728626556 is an admirable number.

It is a super-2 number, since 2×728626556² = 1061793316216842272, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 728626556.

It is a congruent 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, 13011161 + ... + 13011216.

It is an arithmetic number, because the mean of its divisors is an integer number (121437764).

Almost surely, 2^728626556 is an apocalyptic number.

It is an amenable number.

728626556 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

728626556 is a wasteful number, since it uses less digits than its factorization.

728626556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26022388 (or 26022386 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 47.

The square root of 728626556 is about 26993.0834844780. The cubic root of 728626556 is about 899.8462930922.

The spelling of 728626556 in words is "seven hundred twenty-eight million, six hundred twenty-six thousand, five hundred fifty-six".