621245728 has 24 divisors (see below), whose sum is σ = 1225285488. Its totient is φ = 310062144.

The previous prime is 621245711. The next prime is 621245731. The reversal of 621245728 is 827542126.

It is a happy 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, 775 + ... + 35257.

It is an arithmetic number, because the mean of its divisors is an integer number (51053562).

Almost surely, 2^621245728 is an apocalyptic number.

It is an amenable number.

621245728 is a deficient number, since it is larger than the sum of its proper divisors (604039760).

621245728 is a wasteful number, since it uses less digits than its factorization.

621245728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35056 (or 35048 counting only the distinct ones).

The product of its digits is 53760, while the sum is 37.

The square root of 621245728 is about 24924.8014636025. The cubic root of 621245728 is about 853.2726101539.

The spelling of 621245728 in words is "six hundred twenty-one million, two hundred forty-five thousand, seven hundred twenty-eight".