725857644 has 48 divisors (see below), whose sum is σ = 1773741312. Its totient is φ = 230590272.

The previous prime is 725857553. The next prime is 725857661. The reversal of 725857644 is 446758527.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 725857593 and 725857602.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73462 + ... + 82754.

It is an arithmetic number, because the mean of its divisors is an integer number (36952944).

Almost surely, 2^725857644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 725857644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (886870656).

725857644 is an abundant number, since it is smaller than the sum of its proper divisors (1047883668).

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

725857644 is a wasteful number, since it uses less digits than its factorization.

725857644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9606 (or 9604 counting only the distinct ones).

The product of its digits is 1881600, while the sum is 48.

The square root of 725857644 is about 26941.7453777590. The cubic root of 725857644 is about 898.7049868776.

The spelling of 725857644 in words is "seven hundred twenty-five million, eight hundred fifty-seven thousand, six hundred forty-four".