621372990 has 96 divisors (see below), whose sum is σ = 1761661440. Its totient is φ = 137401920.

The previous prime is 621372989. The next prime is 621373013. The reversal of 621372990 is 99273126.

It is a super-2 number, since 2×621372990² = 772208785403080200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 200271 + ... + 203349.

It is an arithmetic number, because the mean of its divisors is an integer number (18350640).

Almost surely, 2^621372990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621372990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (880830720).

621372990 is an abundant number, since it is smaller than the sum of its proper divisors (1140288450).

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

621372990 is a wasteful number, since it uses less digits than its factorization.

621372990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3158 (or 3127 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 621372990 is about 24927.3542519057. The cubic root of 621372990 is about 853.3308703881.

The spelling of 621372990 in words is "six hundred twenty-one million, three hundred seventy-two thousand, nine hundred ninety".