620464644 has 48 divisors (see below), whose sum is σ = 1647858240. Its totient is φ = 201775680.

The previous prime is 620464613. The next prime is 620464651. The reversal of 620464644 is 446464026.

It is a happy number.

620464644 is a `hidden beast` number, since 6 + 2 + 0 + 4 + 6 + 4 + 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 = 620464599 and 620464608.

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 15 ways as a sum of consecutive naturals, for example, 65634 + ... + 74489.

It is an arithmetic number, because the mean of its divisors is an integer number (34330380).

Almost surely, 2^620464644 is an apocalyptic number.

It is an amenable number.

620464644 is an abundant number, since it is smaller than the sum of its proper divisors (1027393596).

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

620464644 is a wasteful number, since it uses less digits than its factorization.

620464644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140177 (or 140169 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 36.

The square root of 620464644 is about 24909.1277245912. The cubic root of 620464644 is about 852.9148574073.

The spelling of 620464644 in words is "six hundred twenty million, four hundred sixty-four thousand, six hundred forty-four".