51593840 has 20 divisors (see below), whose sum is σ = 119955864. Its totient is φ = 20637504.

The previous prime is 51593837. The next prime is 51593849. The reversal of 51593840 is 4839515.

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 51593840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51593849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322382 + ... + 322541.

Almost surely, 2^51593840 is an apocalyptic number.

It is an amenable number.

51593840 is an abundant number, since it is smaller than the sum of its proper divisors (68362024).

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

51593840 is a wasteful number, since it uses less digits than its factorization.

51593840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644936 (or 644930 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 51593840 is about 7182.8852141740. The cubic root of 51593840 is about 372.2767817188.

The spelling of 51593840 in words is "fifty-one million, five hundred ninety-three thousand, eight hundred forty".