51664980 has 24 divisors (see below), whose sum is σ = 144662112. Its totient is φ = 13777312.

The previous prime is 51664939. The next prime is 51664981. The reversal of 51664980 is 8946615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51664981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 430482 + ... + 430601.

It is an arithmetic number, because the mean of its divisors is an integer number (6027588).

Almost surely, 2^51664980 is an apocalyptic number.

It is an amenable number.

51664980 is an abundant number, since it is smaller than the sum of its proper divisors (92997132).

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

51664980 is a wasteful number, since it uses less digits than its factorization.

51664980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861095 (or 861093 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 51664980 is about 7187.8355573844. The cubic root of 51664980 is about 372.4478073504.

The spelling of 51664980 in words is "fifty-one million, six hundred sixty-four thousand, nine hundred eighty".