51465820 has 24 divisors (see below), whose sum is σ = 123518304. Its totient is φ = 17645376.

The previous prime is 51465811. The next prime is 51465833. The reversal of 51465820 is 2856415.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183667 + ... + 183946.

It is an arithmetic number, because the mean of its divisors is an integer number (5146596).

Almost surely, 2^51465820 is an apocalyptic number.

It is an amenable number.

51465820 is an abundant number, since it is smaller than the sum of its proper divisors (72052484).

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

51465820 is a wasteful number, since it uses less digits than its factorization.

51465820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367629 (or 367627 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 51465820 is about 7173.9682184967. The cubic root of 51465820 is about 371.9686160751.

The spelling of 51465820 in words is "fifty-one million, four hundred sixty-five thousand, eight hundred twenty".