51487956 has 36 divisors (see below), whose sum is σ = 140162932. Its totient is φ = 15842304.

The previous prime is 51487939. The next prime is 51487981. The reversal of 51487956 is 65978415.

51487956 is a `hidden beast` number, since 514 + 87 + 9 + 56 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 24800400 + 26687556 = 4980^2 + 5166^2 .

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

It is a super-2 number, since 2×51487956² = 5302019226115872, which contains 22 as substring.

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, 54541 + ... + 55476.

Almost surely, 2^51487956 is an apocalyptic number.

It is an amenable number.

51487956 is an abundant number, since it is smaller than the sum of its proper divisors (88674976).

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

51487956 is a wasteful number, since it uses less digits than its factorization.

51487956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110040 (or 110035 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The square root of 51487956 is about 7175.5108528940. The cubic root of 51487956 is about 372.0219376587.

The spelling of 51487956 in words is "fifty-one million, four hundred eighty-seven thousand, nine hundred fifty-six".