621157820 has 12 divisors (see below), whose sum is σ = 1304431464. Its totient is φ = 248463120.

The previous prime is 621157793. The next prime is 621157837. The reversal of 621157820 is 28751126.

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, 15528926 + ... + 15528965.

It is an arithmetic number, because the mean of its divisors is an integer number (108702622).

Almost surely, 2^621157820 is an apocalyptic number.

It is an amenable number.

621157820 is an abundant number, since it is smaller than the sum of its proper divisors (683273644).

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

621157820 is a wasteful number, since it uses less digits than its factorization.

621157820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31057900 (or 31057898 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 621157820 is about 24923.0379368166. The cubic root of 621157820 is about 853.2323614388.

The spelling of 621157820 in words is "six hundred twenty-one million, one hundred fifty-seven thousand, eight hundred twenty".