621371970 has 24 divisors (see below), whose sum is σ = 1615567356. Its totient is φ = 165699168.

The previous prime is 621371957. The next prime is 621371983. The reversal of 621371970 is 79173126.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (621371957) and next prime (621371983).

It can be written as a sum of positive squares in 2 ways, for example, as 621355329 + 16641 = 24927^2 + 129^2 .

It is a super-2 number, since 2×621371970² = 772206250203361800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3451977 + ... + 3452156.

Almost surely, 2^621371970 is an apocalyptic number.

621371970 is an abundant number, since it is smaller than the sum of its proper divisors (994195386).

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

621371970 is a wasteful number, since it uses less digits than its factorization.

621371970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6904146 (or 6904143 counting only the distinct ones).

The product of its (nonzero) digits is 15876, while the sum is 36.

The square root of 621371970 is about 24927.3337924456. Note that the first 3 decimals coincide. The cubic root of 621371970 is about 853.3304034662.

The spelling of 621371970 in words is "six hundred twenty-one million, three hundred seventy-one thousand, nine hundred seventy".