620662644 has 72 divisors (see below), whose sum is σ = 1817641280. Its totient is φ = 174897792.

The previous prime is 620662597. The next prime is 620662667. The reversal of 620662644 is 446266026.

620662644 is a `hidden beast` number, since 6 + 2 + 0 + 6 + 6 + 2 + 644 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 620662599 and 620662608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1527 + ... + 35265.

Almost surely, 2^620662644 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 620662644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (908820640).

620662644 is an abundant number, since it is smaller than the sum of its proper divisors (1196978636).

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

620662644 is a wasteful number, since it uses less digits than its factorization.

620662644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33829 (or 33824 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The square root of 620662644 is about 24913.1018542453. The cubic root of 620662644 is about 853.0055739280.

The spelling of 620662644 in words is "six hundred twenty million, six hundred sixty-two thousand, six hundred forty-four".