725728 has 12 divisors (see below), whose sum is σ = 1428840. Its totient is φ = 362848.

The previous prime is 725723. The next prime is 725731. The reversal of 725728 is 827527.

It is a super-2 number, since 2×725728² = 1053362259968, 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 725728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11308 + ... + 11371.

It is an arithmetic number, because the mean of its divisors is an integer number (119070).

2⁷²⁵⁷²⁸ is an apocalyptic number.

It is an amenable number.

725728 is a deficient number, since it is larger than the sum of its proper divisors (703112).

725728 is a wasteful number, since it uses less digits than its factorization.

725728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22689 (or 22681 counting only the distinct ones).

The product of its digits is 7840, while the sum is 31.

The square root of 725728 is about 851.8967073537. The cubic root of 725728 is about 89.8651478384.

The spelling of 725728 in words is "seven hundred twenty-five thousand, seven hundred twenty-eight".