725664737 has 16 divisors (see below), whose sum is σ = 881793792. Its totient is φ = 582958080.

The previous prime is 725664733. The next prime is 725664761. The reversal of 725664737 is 737466527.

It is a cyclic number.

It is not a de Polignac number, because 725664737 - 2² = 725664733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 725664691 and 725664700.

It is not an unprimeable number, because it can be changed into a prime (725664733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16028 + ... + 41330.

It is an arithmetic number, because the mean of its divisors is an integer number (55112112).

Almost surely, 2^725664737 is an apocalyptic number.

It is an amenable number.

725664737 is a deficient number, since it is larger than the sum of its proper divisors (156129055).

725664737 is a wasteful number, since it uses less digits than its factorization.

725664737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25568.

The product of its digits is 1481760, while the sum is 47.

The square root of 725664737 is about 26938.1650637158. The cubic root of 725664737 is about 898.6253652765.

The spelling of 725664737 in words is "seven hundred twenty-five million, six hundred sixty-four thousand, seven hundred thirty-seven".