728863992 has 24 divisors (see below), whose sum is σ = 1974006840. Its totient is φ = 242954640.

The previous prime is 728863973. The next prime is 728864023. The reversal of 728863992 is 299368827.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5061484 + ... + 5061627.

It is an arithmetic number, because the mean of its divisors is an integer number (82250285).

Almost surely, 2^728863992 is an apocalyptic number.

728863992 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

728863992 is an abundant number, since it is smaller than the sum of its proper divisors (1245142848).

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

728863992 is a wasteful number, since it uses less digits than its factorization.

728863992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10123123 (or 10123116 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The square root of 728863992 is about 26997.4812158468. The cubic root of 728863992 is about 899.9440261485.

The spelling of 728863992 in words is "seven hundred twenty-eight million, eight hundred sixty-three thousand, nine hundred ninety-two".