51988685 has 16 divisors (see below), whose sum is σ = 72306432. Its totient is φ = 35145600.

The previous prime is 51988681. The next prime is 51988723. The reversal of 51988685 is 58688915.

It is not a de Polignac number, because 51988685 - 2² = 51988681 is a prime.

It is a super-3 number, since 3×51988685³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51988681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7976 + ... + 12945.

It is an arithmetic number, because the mean of its divisors is an integer number (4519152).

Almost surely, 2^51988685 is an apocalyptic number.

It is an amenable number.

51988685 is a deficient number, since it is larger than the sum of its proper divisors (20317747).

51988685 is a wasteful number, since it uses less digits than its factorization.

51988685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21004.

The product of its digits is 691200, while the sum is 50.

The square root of 51988685 is about 7210.3179541543. The cubic root of 51988685 is about 373.2240410488.

The spelling of 51988685 in words is "fifty-one million, nine hundred eighty-eight thousand, six hundred eighty-five".