51657012 has 36 divisors (see below), whose sum is σ = 142449216. Its totient is φ = 15653520.

The previous prime is 51656993. The next prime is 51657013. The reversal of 51657012 is 21075615.

51657012 is a `hidden beast` number, since 5 + 1 + 657 + 0 + 1 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51657013) by changing a digit.

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, 64828 + ... + 65619.

Almost surely, 2^51657012 is an apocalyptic number.

It is an amenable number.

51657012 is an abundant number, since it is smaller than the sum of its proper divisors (90792204).

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

51657012 is a wasteful number, since it uses less digits than its factorization.

51657012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130468 (or 130463 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 51657012 is about 7187.2812662369. The cubic root of 51657012 is about 372.4286595208.

The spelling of 51657012 in words is "fifty-one million, six hundred fifty-seven thousand, twelve".