51257868 has 12 divisors (see below), whose sum is σ = 119601720. Its totient is φ = 17085952.

The previous prime is 51257867. The next prime is 51257887. The reversal of 51257868 is 86875215.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (51257863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2135733 + ... + 2135756.

It is an arithmetic number, because the mean of its divisors is an integer number (9966810).

Almost surely, 2^51257868 is an apocalyptic number.

It is an amenable number.

51257868 is an abundant number, since it is smaller than the sum of its proper divisors (68343852).

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

51257868 is a wasteful number, since it uses less digits than its factorization.

51257868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4271496 (or 4271494 counting only the distinct ones).

The product of its digits is 134400, while the sum is 42.

The square root of 51257868 is about 7159.4600355055. The cubic root of 51257868 is about 371.4669495706.

It can be divided in two parts, 51257 and 868, that added together give a palindrome (52125).

The spelling of 51257868 in words is "fifty-one million, two hundred fifty-seven thousand, eight hundred sixty-eight".