721428472 has 16 divisors (see below), whose sum is σ = 1361638800. Its totient is φ = 358324800.

The previous prime is 721428451. The next prime is 721428493. The reversal of 721428472 is 274824127.

It is an interprime number because it is at equal distance from previous prime (721428451) and next prime (721428493).

It is a congruent number.

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, 297397 + ... + 299812.

It is an arithmetic number, because the mean of its divisors is an integer number (85102425).

Almost surely, 2^721428472 is an apocalyptic number.

It is an amenable number.

721428472 is a deficient number, since it is larger than the sum of its proper divisors (640210328).

721428472 is a wasteful number, since it uses less digits than its factorization.

721428472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597366 (or 597362 counting only the distinct ones).

The product of its digits is 50176, while the sum is 37.

The square root of 721428472 is about 26859.4205447549. The cubic root of 721428472 is about 896.8732948965.

The spelling of 721428472 in words is "seven hundred twenty-one million, four hundred twenty-eight thousand, four hundred seventy-two".