51625644 has 48 divisors (see below), whose sum is σ = 139738368. Its totient is φ = 14528448.

The previous prime is 51625643. The next prime is 51625661. The reversal of 51625644 is 44652615.

It is not an unprimeable number, because it can be changed into a prime (51625643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1042 + ... + 10214.

It is an arithmetic number, because the mean of its divisors is an integer number (2911216).

Almost surely, 2^51625644 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 51625644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69869184).

51625644 is an abundant number, since it is smaller than the sum of its proper divisors (88112724).

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

51625644 is a wasteful number, since it uses less digits than its factorization.

51625644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9254 (or 9252 counting only the distinct ones).

The product of its digits is 28800, while the sum is 33.

The square root of 51625644 is about 7185.0987467118. The cubic root of 51625644 is about 372.3532602208.

The spelling of 51625644 in words is "fifty-one million, six hundred twenty-five thousand, six hundred forty-four".