51671664 has 60 divisors (see below), whose sum is σ = 157759992. Its totient is φ = 15657600.

The previous prime is 51671611. The next prime is 51671677. The reversal of 51671664 is 46617615.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14727 + ... + 17894.

Almost surely, 2^51671664 is an apocalyptic number.

It is an amenable number.

51671664 is an abundant number, since it is smaller than the sum of its proper divisors (106088328).

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

51671664 is a wasteful number, since it uses less digits than its factorization.

51671664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32646 (or 32637 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 51671664 is about 7188.3004945536. The cubic root of 51671664 is about 372.4638680928.

The spelling of 51671664 in words is "fifty-one million, six hundred seventy-one thousand, six hundred sixty-four".