725257645 has 16 divisors (see below), whose sum is σ = 1046989440. Its totient is φ = 471144384.

The previous prime is 725257613. The next prime is 725257657. The reversal of 725257645 is 546752527.

It is a cyclic number.

It is not a de Polignac number, because 725257645 - 2⁵ = 725257613 is a prime.

It is a super-3 number, since 3×725257645³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 544642 + ... + 545971.

It is an arithmetic number, because the mean of its divisors is an integer number (65436840).

Almost surely, 2^725257645 is an apocalyptic number.

It is an amenable number.

725257645 is a deficient number, since it is larger than the sum of its proper divisors (321731795).

725257645 is a wasteful number, since it uses less digits than its factorization.

725257645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090644.

The product of its digits is 588000, while the sum is 43.

The square root of 725257645 is about 26930.6079582322. The cubic root of 725257645 is about 898.4572933429.

The spelling of 725257645 in words is "seven hundred twenty-five million, two hundred fifty-seven thousand, six hundred forty-five".