721631248 has 40 divisors (see below), whose sum is σ = 1584968000. Its totient is φ = 315529344.

The previous prime is 721631231. The next prime is 721631269. The reversal of 721631248 is 842136127.

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, 87348 + ... + 95251.

It is an arithmetic number, because the mean of its divisors is an integer number (39624200).

Almost surely, 2^721631248 is an apocalyptic number.

It is an amenable number.

721631248 is an abundant number, since it is smaller than the sum of its proper divisors (863336752).

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

721631248 is a wasteful number, since it uses less digits than its factorization.

721631248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182639 (or 182633 counting only the distinct ones).

The product of its digits is 16128, while the sum is 34.

The square root of 721631248 is about 26863.1950445214. The cubic root of 721631248 is about 896.9573167826.

The spelling of 721631248 in words is "seven hundred twenty-one million, six hundred thirty-one thousand, two hundred forty-eight".