51757640 has 64 divisors (see below), whose sum is σ = 128736000. Its totient is φ = 18570240.

The previous prime is 51757637. The next prime is 51757697. The reversal of 51757640 is 4675715.

It is a self number, because there is not a number n which added to its sum of digits gives 51757640.

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, 34016 + ... + 35504.

It is an arithmetic number, because the mean of its divisors is an integer number (2011500).

Almost surely, 2^51757640 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 51757640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64368000).

51757640 is an abundant number, since it is smaller than the sum of its proper divisors (76978360).

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

51757640 is a wasteful number, since it uses less digits than its factorization.

51757640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1590 (or 1586 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 35.

The square root of 51757640 is about 7194.2782820794. The cubic root of 51757640 is about 372.6703333424.

The spelling of 51757640 in words is "fifty-one million, seven hundred fifty-seven thousand, six hundred forty".