725628897 has 18 divisors (see below), whose sum is σ = 1219254738. Its totient is φ = 414644832.

The previous prime is 725628877. The next prime is 725628899. The reversal of 725628897 is 798826527.

It is a happy number.

725628897 is a `hidden beast` number, since 7 + 2 + 5 + 628 + 8 + 9 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 597509136 + 128119761 = 24444^2 + 11319^2 .

It is not a de Polignac number, because 725628897 - 2⁸ = 725628641 is a prime.

It is a super-2 number, since 2×725628897² = 1053074592322873218, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (725628899) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 822268 + ... + 823149.

Almost surely, 2^725628897 is an apocalyptic number.

It is an amenable number.

725628897 is a deficient number, since it is larger than the sum of its proper divisors (493625841).

725628897 is a wasteful number, since it uses less digits than its factorization.

725628897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1645437 (or 1645427 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 54.

The square root of 725628897 is about 26937.4998283063. The cubic root of 725628897 is about 898.6105709040.

The spelling of 725628897 in words is "seven hundred twenty-five million, six hundred twenty-eight thousand, eight hundred ninety-seven".