51276640 has 96 divisors (see below), whose sum is σ = 128731680. Its totient is φ = 19267584.

The previous prime is 51276629. The next prime is 51276677. The reversal of 51276640 is 4667215.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199392 + ... + 199648.

It is an arithmetic number, because the mean of its divisors is an integer number (1340955).

Almost surely, 2^51276640 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 51276640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64365840).

51276640 is an abundant number, since it is smaller than the sum of its proper divisors (77455040).

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

51276640 is a wasteful number, since it uses less digits than its factorization.

51276640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344 (or 336 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 51276640 is about 7160.7709082193. The cubic root of 51276640 is about 371.5122910747.

The spelling of 51276640 in words is "fifty-one million, two hundred seventy-six thousand, six hundred forty".