51875440 has 40 divisors (see below), whose sum is σ = 122322528. Its totient is φ = 20455680.

The previous prime is 51875413. The next prime is 51875471. The reversal of 51875440 is 4457815.

51875440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×51875440² = 5382122550387200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51875396 and 51875405.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1114 + ... + 10246.

Almost surely, 2^51875440 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 51875440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61161264).

51875440 is an abundant number, since it is smaller than the sum of its proper divisors (70447088).

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

51875440 is a wasteful number, since it uses less digits than its factorization.

51875440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9217 (or 9211 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 51875440 is about 7202.4606906251. The cubic root of 51875440 is about 372.9528507417.

The spelling of 51875440 in words is "fifty-one million, eight hundred seventy-five thousand, four hundred forty".