51664004 has 12 divisors (see below), whose sum is σ = 103328064. Its totient is φ = 22141704.

The previous prime is 51664001. The next prime is 51664033. The reversal of 51664004 is 40046615.

It is a happy number.

51664004 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (51664001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 922544 + ... + 922599.

It is an arithmetic number, because the mean of its divisors is an integer number (8610672).

Almost surely, 2^51664004 is an apocalyptic number.

It is an amenable number.

51664004 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

51664004 is a wasteful number, since it uses less digits than its factorization.

51664004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1845154 (or 1845152 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 51664004 is about 7187.7676645813. The cubic root of 51664004 is about 372.4454620393.

The spelling of 51664004 in words is "fifty-one million, six hundred sixty-four thousand, four".