51640875 has 128 divisors (see below), whose sum is σ = 113218560. Its totient is φ = 22896000.

The previous prime is 51640873. The next prime is 51640891. The reversal of 51640875 is 57804615.

51640875 is a `hidden beast` number, since 5 + 1 + 640 + 8 + 7 + 5 = 666.

It is not a de Polignac number, because 51640875 - 2¹ = 51640873 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51640873) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 482572 + ... + 482678.

It is an arithmetic number, because the mean of its divisors is an integer number (884520).

Almost surely, 2^51640875 is an apocalyptic number.

51640875 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51640875 is an abundant number, since it is smaller than the sum of its proper divisors (61577685).

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

51640875 is a wasteful number, since it uses less digits than its factorization.

51640875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155 (or 139 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 51640875 is about 7186.1585704742. The cubic root of 51640875 is about 372.3898748075.

The spelling of 51640875 in words is "fifty-one million, six hundred forty thousand, eight hundred seventy-five".