620451664 has 40 divisors (see below), whose sum is σ = 1376017088. Its totient is φ = 265489920.

The previous prime is 620451641. The next prime is 620451677. The reversal of 620451664 is 466154026.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73384 + ... + 81400.

Almost surely, 2^620451664 is an apocalyptic number.

It is an amenable number.

620451664 is an abundant number, since it is smaller than the sum of its proper divisors (755565424).

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

620451664 is a wasteful number, since it uses less digits than its factorization.

620451664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8723 (or 8717 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 620451664 is about 24908.8671761684. The cubic root of 620451664 is about 852.9089097613.

The spelling of 620451664 in words is "six hundred twenty million, four hundred fifty-one thousand, six hundred sixty-four".