51788240 has 40 divisors (see below), whose sum is σ = 137610240. Its totient is φ = 17755776.

The previous prime is 51788237. The next prime is 51788291. The reversal of 51788240 is 4288715.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 51788240.

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, 45680 + ... + 46799.

It is an arithmetic number, because the mean of its divisors is an integer number (3440256).

Almost surely, 2^51788240 is an apocalyptic number.

It is an amenable number.

51788240 is an abundant number, since it is smaller than the sum of its proper divisors (85822000).

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

51788240 is a wasteful number, since it uses less digits than its factorization.

51788240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92499 (or 92493 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 51788240 is about 7196.4046578830. The cubic root of 51788240 is about 372.7437618938.

The spelling of 51788240 in words is "fifty-one million, seven hundred eighty-eight thousand, two hundred forty".