620634664 has 64 divisors (see below), whose sum is σ = 1289811600. Its totient is φ = 278194176.

The previous prime is 620634653. The next prime is 620634673. The reversal of 620634664 is 466436026.

It can be written as a sum of positive squares in 8 ways, for example, as 495418564 + 125216100 = 22258^2 + 11190^2 .

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, 600292 + ... + 601324.

Almost surely, 2^620634664 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 620634664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (644905800).

620634664 is an abundant number, since it is smaller than the sum of its proper divisors (669176936).

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

620634664 is a wasteful number, since it uses less digits than its factorization.

620634664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1214 (or 1210 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 37.

The square root of 620634664 is about 24912.5402960035. The cubic root of 620634664 is about 852.9927556630.

The spelling of 620634664 in words is "six hundred twenty million, six hundred thirty-four thousand, six hundred sixty-four".