51805872 has 40 divisors (see below), whose sum is σ = 148703280. Its totient is φ = 17268480.

The previous prime is 51805843. The next prime is 51805877. The reversal of 51805872 is 27850815.

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

It is not an unprimeable number, because it can be changed into a prime (51805877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59529 + ... + 60392.

It is an arithmetic number, because the mean of its divisors is an integer number (3717582).

Almost surely, 2^51805872 is an apocalyptic number.

It is an amenable number.

51805872 is an abundant number, since it is smaller than the sum of its proper divisors (96897408).

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

51805872 is a wasteful number, since it uses less digits than its factorization.

51805872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119938 (or 119926 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 51805872 is about 7197.6296098091. The cubic root of 51805872 is about 372.7860589628.

The spelling of 51805872 in words is "fifty-one million, eight hundred five thousand, eight hundred seventy-two".