51687279 has 24 divisors (see below), whose sum is σ = 89037312. Its totient is φ = 28250640.

The previous prime is 51687271. The next prime is 51687281. The reversal of 51687279 is 97278615.

It is not a de Polignac number, because 51687279 - 2³ = 51687271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51687271) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16387 + ... + 19284.

It is an arithmetic number, because the mean of its divisors is an integer number (3709888).

Almost surely, 2^51687279 is an apocalyptic number.

51687279 is a deficient number, since it is larger than the sum of its proper divisors (37350033).

51687279 is a wasteful number, since it uses less digits than its factorization.

51687279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35707 (or 35704 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 51687279 is about 7189.3865524118. The cubic root of 51687279 is about 372.5013834160.

The spelling of 51687279 in words is "fifty-one million, six hundred eighty-seven thousand, two hundred seventy-nine".