51851680 has 24 divisors (see below), whose sum is σ = 122499972. Its totient is φ = 20740608.

The previous prime is 51851671. The next prime is 51851707. The reversal of 51851680 is 8615815.

It can be written as a sum of positive squares in 2 ways, for example, as 42042256 + 9809424 = 6484^2 + 3132^2 .

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

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, 161877 + ... + 162196.

Almost surely, 2^51851680 is an apocalyptic number.

It is an amenable number.

51851680 is an abundant number, since it is smaller than the sum of its proper divisors (70648292).

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

51851680 is a wasteful number, since it uses less digits than its factorization.

51851680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324088 (or 324080 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 34.

The square root of 51851680 is about 7200.8110654287. The cubic root of 51851680 is about 372.8959020650.

The spelling of 51851680 in words is "fifty-one million, eight hundred fifty-one thousand, six hundred eighty".