51659988 has 12 divisors (see below), whose sum is σ = 120540000. Its totient is φ = 17219992.

The previous prime is 51659977. The next prime is 51659989. The reversal of 51659988 is 88995615.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 51659988.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51659989) 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, 2152488 + ... + 2152511.

It is an arithmetic number, because the mean of its divisors is an integer number (10045000).

Almost surely, 2^51659988 is an apocalyptic number.

It is an amenable number.

51659988 is an abundant number, since it is smaller than the sum of its proper divisors (68880012).

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

51659988 is a wasteful number, since it uses less digits than its factorization.

51659988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4305006 (or 4305004 counting only the distinct ones).

The product of its digits is 777600, while the sum is 51.

The square root of 51659988 is about 7187.4882956426. The cubic root of 51659988 is about 372.4358113501.

The spelling of 51659988 in words is "fifty-one million, six hundred fifty-nine thousand, nine hundred eighty-eight".