728663736 has 64 divisors (see below), whose sum is σ = 1906675200. Its totient is φ = 231617408.

The previous prime is 728663671. The next prime is 728663753. The reversal of 728663736 is 637366827.

It is a super-2 number, since 2×728663736² = 1061901680322955392, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196330 + ... + 200006.

It is an arithmetic number, because the mean of its divisors is an integer number (29791800).

Almost surely, 2^728663736 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 728663736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (953337600).

728663736 is an abundant number, since it is smaller than the sum of its proper divisors (1178011464).

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

728663736 is a wasteful number, since it uses less digits than its factorization.

728663736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4068 (or 4064 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 48.

The square root of 728663736 is about 26993.7721706322. The cubic root of 728663736 is about 899.8615984709.

The spelling of 728663736 in words is "seven hundred twenty-eight million, six hundred sixty-three thousand, seven hundred thirty-six".