620658864 has 240 divisors, whose sum is σ = 2182003200. Its totient is φ = 160579584.

The previous prime is 620658859. The next prime is 620658881. The reversal of 620658864 is 468856026.

620658864 is a `hidden beast` number, since 6 + 2 + 0 + 6 + 588 + 64 = 666.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 439792 + ... + 441200.

It is an arithmetic number, because the mean of its divisors is an integer number (9091680).

Almost surely, 2^620658864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 620658864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1091001600).

620658864 is an abundant number, since it is smaller than the sum of its proper divisors (1561344336).

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

620658864 is a wasteful number, since it uses less digits than its factorization.

620658864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1472 (or 1463 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The square root of 620658864 is about 24913.0259904332. The cubic root of 620658864 is about 853.0038422478.

The spelling of 620658864 in words is "six hundred twenty million, six hundred fifty-eight thousand, eight hundred sixty-four".