51630720 has 64 divisors (see below), whose sum is σ = 164579040. Its totient is φ = 13767680.

The previous prime is 51630713. The next prime is 51630721. The reversal of 51630720 is 2703615.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51630721) 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, 11526 + ... + 15365.

Almost surely, 2^51630720 is an apocalyptic number.

It is an amenable number.

51630720 is an abundant number, since it is smaller than the sum of its proper divisors (112948320).

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

51630720 is a wasteful number, since it uses less digits than its factorization.

51630720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26913 (or 26901 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 51630720 is about 7185.4519690831. The cubic root of 51630720 is about 372.3654634791.

The spelling of 51630720 in words is "fifty-one million, six hundred thirty thousand, seven hundred twenty".