621979936 has 24 divisors (see below), whose sum is σ = 1266749820. Its totient is φ = 300265728.

The previous prime is 621979931. The next prime is 621979949. The reversal of 621979936 is 639979126.

It can be written as a sum of positive squares in 2 ways, for example, as 612859536 + 9120400 = 24756^2 + 3020^2 .

It is not an unprimeable number, because it can be changed into a prime (621979931) 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, 334191 + ... + 336046.

Almost surely, 2^621979936 is an apocalyptic number.

It is an amenable number.

621979936 is an abundant number, since it is smaller than the sum of its proper divisors (644769884).

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

621979936 is a wasteful number, since it uses less digits than its factorization.

621979936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670276 (or 670268 counting only the distinct ones).

The product of its digits is 1102248, while the sum is 52.

The square root of 621979936 is about 24939.5255768830. The cubic root of 621979936 is about 853.6086194077.

The spelling of 621979936 in words is "six hundred twenty-one million, nine hundred seventy-nine thousand, nine hundred thirty-six".