621242920 has 64 divisors (see below), whose sum is σ = 1418860800. Its totient is φ = 244780800.

The previous prime is 621242911. The next prime is 621242927. The reversal of 621242920 is 29242126.

It is not an unprimeable number, because it can be changed into a prime (621242927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1482471 + ... + 1482889.

It is an arithmetic number, because the mean of its divisors is an integer number (22169700).

Almost surely, 2^621242920 is an apocalyptic number.

It is an amenable number.

621242920 is an abundant number, since it is smaller than the sum of its proper divisors (797617880).

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

621242920 is a wasteful number, since it uses less digits than its factorization.

621242920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 898 (or 894 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 621242920 is about 24924.7451341032. The cubic root of 621242920 is about 853.2713245686.

The spelling of 621242920 in words is "six hundred twenty-one million, two hundred forty-two thousand, nine hundred twenty".