51800724 has 72 divisors (see below), whose sum is σ = 135655520. Its totient is φ = 16656192.

The previous prime is 51800689. The next prime is 51800731. The reversal of 51800724 is 42700815.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 168579 + ... + 168885.

Almost surely, 2^51800724 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 51800724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67827760).

51800724 is an abundant number, since it is smaller than the sum of its proper divisors (83854796).

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

51800724 is a wasteful number, since it uses less digits than its factorization.

51800724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469 (or 464 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 51800724 is about 7197.2719831892. The cubic root of 51800724 is about 372.7737105157.

Subtracting from 51800724 its reverse (42700815), we obtain a palindrome (9099909).

The spelling of 51800724 in words is "fifty-one million, eight hundred thousand, seven hundred twenty-four".