621670564 has 36 divisors (see below), whose sum is σ = 1134066388. Its totient is φ = 298166400.

The previous prime is 621670561. The next prime is 621670571. The reversal of 621670564 is 465076126.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 45670564 + 576000000 = 6758^2 + 24000^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621670561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 608374 + ... + 609394.

Almost surely, 2^621670564 is an apocalyptic number.

It is an amenable number.

621670564 is a deficient number, since it is larger than the sum of its proper divisors (512395824).

621670564 is a wasteful number, since it uses less digits than its factorization.

621670564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1264 (or 1233 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 621670564 is about 24933.3223618514. The cubic root of 621670564 is about 853.4670680021.

The spelling of 621670564 in words is "six hundred twenty-one million, six hundred seventy thousand, five hundred sixty-four".