721478504 has 16 divisors (see below), whose sum is σ = 1432347300. Its totient is φ = 339519232.

The previous prime is 721478479. The next prime is 721478509. The reversal of 721478504 is 405874127.

It can be written as a sum of positive squares in 2 ways, for example, as 697488100 + 23990404 = 26410^2 + 4898^2 .

It is not an unprimeable number, because it can be changed into a prime (721478509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2652359 + ... + 2652630.

Almost surely, 2^721478504 is an apocalyptic number.

It is an amenable number.

721478504 is a deficient number, since it is larger than the sum of its proper divisors (710868796).

721478504 is a wasteful number, since it uses less digits than its factorization.

721478504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5305012 (or 5305008 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 38.

The square root of 721478504 is about 26860.3518964291. The cubic root of 721478504 is about 896.8940275259.

The spelling of 721478504 in words is "seven hundred twenty-one million, four hundred seventy-eight thousand, five hundred four".