725221507 has 8 divisors (see below), whose sum is σ = 764467200. Its totient is φ = 686083464.

The previous prime is 725221463. The next prime is 725221537. The reversal of 725221507 is 705122527.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-725221507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (725221537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12883 + ... + 40204.

It is an arithmetic number, because the mean of its divisors is an integer number (95558400).

Almost surely, 2^725221507 is an apocalyptic number.

725221507 is a deficient number, since it is larger than the sum of its proper divisors (39245693).

725221507 is a wasteful number, since it uses less digits than its factorization.

725221507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53825.

The product of its (nonzero) digits is 9800, while the sum is 31.

The square root of 725221507 is about 26929.9370032683. The cubic root of 725221507 is about 898.4423703753.

The spelling of 725221507 in words is "seven hundred twenty-five million, two hundred twenty-one thousand, five hundred seven".