721428752 has 20 divisors (see below), whose sum is σ = 1524838416. Its totient is φ = 327922080.

The previous prime is 721428703. The next prime is 721428791. The reversal of 721428752 is 257824127.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2049338 + ... + 2049689.

Almost surely, 2^721428752 is an apocalyptic number.

It is an amenable number.

721428752 is an abundant number, since it is smaller than the sum of its proper divisors (803409664).

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

721428752 is a wasteful number, since it uses less digits than its factorization.

721428752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4099046 (or 4099040 counting only the distinct ones).

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

The square root of 721428752 is about 26859.4257570783. The cubic root of 721428752 is about 896.8734109277.

The spelling of 721428752 in words is "seven hundred twenty-one million, four hundred twenty-eight thousand, seven hundred fifty-two".