51156580 has 48 divisors (see below), whose sum is σ = 111953520. Its totient is φ = 19611648.

The previous prime is 51156571. The next prime is 51156629. The reversal of 51156580 is 8565115.

It can be written as a sum of positive squares in 8 ways, for example, as 5476 + 51151104 = 74^2 + 7152^2 .

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 15 ways as a sum of consecutive naturals, for example, 111712 + ... + 112168.

It is an arithmetic number, because the mean of its divisors is an integer number (2332365).

Almost surely, 2^51156580 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51156580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55976760).

51156580 is an abundant number, since it is smaller than the sum of its proper divisors (60796940).

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

51156580 is a wasteful number, since it uses less digits than its factorization.

51156580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688 (or 686 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 31.

The square root of 51156580 is about 7152.3828197322. The cubic root of 51156580 is about 371.2221094051. Note that the first 3 decimals are identical.

The spelling of 51156580 in words is "fifty-one million, one hundred fifty-six thousand, five hundred eighty".