51587780 has 12 divisors (see below), whose sum is σ = 108334380. Its totient is φ = 20635104.

The previous prime is 51587759. The next prime is 51587797. The reversal of 51587780 is 8778515.

It can be written as a sum of positive squares in 2 ways, for example, as 39740416 + 11847364 = 6304^2 + 3442^2 .

It is a super-2 number, since 2×51587780² = 5322598090656800, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 1289675 + ... + 1289714.

It is an arithmetic number, because the mean of its divisors is an integer number (9027865).

Almost surely, 2^51587780 is an apocalyptic number.

It is an amenable number.

51587780 is an abundant number, since it is smaller than the sum of its proper divisors (56746600).

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

51587780 is a wasteful number, since it uses less digits than its factorization.

51587780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2579398 (or 2579396 counting only the distinct ones).

The product of its (nonzero) digits is 78400, while the sum is 41.

The square root of 51587780 is about 7182.4633657263. The cubic root of 51587780 is about 372.2622057822.

The spelling of 51587780 in words is "fifty-one million, five hundred eighty-seven thousand, seven hundred eighty".