725128 has 8 divisors (see below), whose sum is σ = 1359630. Its totient is φ = 362560.

The previous prime is 725119. The next prime is 725147. The reversal of 725128 is 821527.

It can be written as a sum of positive squares in only one way, i.e., 492804 + 232324 = 702^2 + 482^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a plaindrome in base 11.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45313 + ... + 45328.

2⁷²⁵¹²⁸ is an apocalyptic number.

It is an amenable number.

725128 is a deficient number, since it is larger than the sum of its proper divisors (634502).

725128 is a wasteful number, since it uses less digits than its factorization.

725128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90647 (or 90643 counting only the distinct ones).

The product of its digits is 1120, while the sum is 25.

The square root of 725128 is about 851.5444791671. The cubic root of 725128 is about 89.8403754927.

The spelling of 725128 in words is "seven hundred twenty-five thousand, one hundred twenty-eight".