725664840 has 32 divisors (see below), whose sum is σ = 2176994880. Its totient is φ = 193510592.

The previous prime is 725664827. The next prime is 725664851. The reversal of 725664840 is 48466527.

It is a junction number, because it is equal to n+sod(n) for n = 725664792 and 725664801.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3023484 + ... + 3023723.

It is an arithmetic number, because the mean of its divisors is an integer number (68031090).

Almost surely, 2^725664840 is an apocalyptic number.

It is an amenable number.

725664840 is an abundant number, since it is smaller than the sum of its proper divisors (1451330040).

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

725664840 is a wasteful number, since it uses less digits than its factorization.

725664840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6047221 (or 6047217 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 42.

The square root of 725664840 is about 26938.1669755015. The cubic root of 725664840 is about 898.6254077931.

The spelling of 725664840 in words is "seven hundred twenty-five million, six hundred sixty-four thousand, eight hundred forty".