664603620 has 48 divisors (see below), whose sum is σ = 1911190848. Its totient is φ = 172437120.

The previous prime is 664603613. The next prime is 664603631. The reversal of 664603620 is 26306466.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147466 + ... + 151905.

It is an arithmetic number, because the mean of its divisors is an integer number (39816476).

Almost surely, 2^664603620 is an apocalyptic number.

664603620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

664603620 is an abundant number, since it is smaller than the sum of its proper divisors (1246587228).

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

664603620 is a wasteful number, since it uses less digits than its factorization.

664603620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299420 (or 299418 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 33.

The square root of 664603620 is about 25779.9072923081. The cubic root of 664603620 is about 872.6784149771.

The spelling of 664603620 in words is "six hundred sixty-four million, six hundred three thousand, six hundred twenty".