721051928 has 16 divisors (see below), whose sum is σ = 1365359760. Its totient is φ = 356956000.

The previous prime is 721051927. The next prime is 721051937. The reversal of 721051928 is 829150127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721051927) 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, 445388 + ... + 447003.

It is an arithmetic number, because the mean of its divisors is an integer number (85334985).

Almost surely, 2^721051928 is an apocalyptic number.

It is an amenable number.

721051928 is a deficient number, since it is larger than the sum of its proper divisors (644307832).

721051928 is a wasteful number, since it uses less digits than its factorization.

721051928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892498 (or 892494 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 721051928 is about 26852.4100966747. The cubic root of 721051928 is about 896.7172290524.

The spelling of 721051928 in words is "seven hundred twenty-one million, fifty-one thousand, nine hundred twenty-eight".