51383664 has 30 divisors (see below), whose sum is σ = 143803296. Its totient is φ = 17127840.

The previous prime is 51383617. The next prime is 51383669. The reversal of 51383664 is 46638315.

51383664 is a `hidden beast` number, since 513 + 83 + 6 + 64 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51383669) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 178272 + ... + 178559.

Almost surely, 2^51383664 is an apocalyptic number.

It is an amenable number.

51383664 is an abundant number, since it is smaller than the sum of its proper divisors (92419632).

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

51383664 is a wasteful number, since it uses less digits than its factorization.

51383664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356845 (or 356836 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 51383664 is about 7168.2399513409. The cubic root of 51383664 is about 371.7705834847.

The spelling of 51383664 in words is "fifty-one million, three hundred eighty-three thousand, six hundred sixty-four".