721616452 has 12 divisors (see below), whose sum is σ = 1280615616. Its totient is φ = 355726280.

The previous prime is 721616449. The next prime is 721616491. The reversal of 721616452 is 254616127.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1270168 + ... + 1270735.

It is an arithmetic number, because the mean of its divisors is an integer number (106717968).

Almost surely, 2^721616452 is an apocalyptic number.

It is an amenable number.

721616452 is a deficient number, since it is larger than the sum of its proper divisors (558999164).

721616452 is a wasteful number, since it uses less digits than its factorization.

721616452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2540978 (or 2540976 counting only the distinct ones).

The product of its digits is 20160, while the sum is 34.

The square root of 721616452 is about 26862.9196477226. The cubic root of 721616452 is about 896.9511864720.

The spelling of 721616452 in words is "seven hundred twenty-one million, six hundred sixteen thousand, four hundred fifty-two".