664630028 has 24 divisors (see below), whose sum is σ = 1235907792. Its totient is φ = 311652864.

The previous prime is 664629997. The next prime is 664630039. The reversal of 664630028 is 820036466.

It is a self number, because there is not a number n which added to its sum of digits gives 664630028.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1976 + ... + 36512.

It is an arithmetic number, because the mean of its divisors is an integer number (51496158).

Almost surely, 2^664630028 is an apocalyptic number.

664630028 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

664630028 is a deficient number, since it is larger than the sum of its proper divisors (571277764).

664630028 is a wasteful number, since it uses less digits than its factorization.

664630028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34841 (or 34839 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 664630028 is about 25780.4194690467. The cubic root of 664630028 is about 872.6899734388.

The spelling of 664630028 in words is "six hundred sixty-four million, six hundred thirty thousand, twenty-eight".