51875640 has 128 divisors (see below), whose sum is σ = 175348800. Its totient is φ = 13810176.

The previous prime is 51875627. The next prime is 51875647. The reversal of 51875640 is 4657815.

51875640 is a `hidden beast` number, since 5 + 1 + 8 + 7 + 5 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 51875595 and 51875604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51875647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87184 + ... + 87776.

Almost surely, 2^51875640 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 51875640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87674400).

51875640 is an abundant number, since it is smaller than the sum of its proper divisors (123473160).

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

51875640 is an equidigital number, since it uses as much as digits as its factorization.

It is an anagram of its base 12 representation: 51875640 = (15458760)₁₂.

51875640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625 (or 603 counting only the distinct ones).

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

The square root of 51875640 is about 7202.4745747555. The cubic root of 51875640 is about 372.9533300338.

The spelling of 51875640 in words is "fifty-one million, eight hundred seventy-five thousand, six hundred forty".