51705387 has 12 divisors (see below), whose sum is σ = 76507704. Its totient is φ = 33629280.

The previous prime is 51705377. The next prime is 51705413. The reversal of 51705387 is 78350715.

51705387 is a `hidden beast` number, since 51 + 70 + 538 + 7 = 666.

It is not a de Polignac number, because 51705387 - 2¹¹ = 51703339 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51705337) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69693 + ... + 70430.

It is an arithmetic number, because the mean of its divisors is an integer number (6375642).

Almost surely, 2^51705387 is an apocalyptic number.

51705387 is a deficient number, since it is larger than the sum of its proper divisors (24802317).

51705387 is a wasteful number, since it uses less digits than its factorization.

51705387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140170 (or 140167 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 36.

The square root of 51705387 is about 7190.6457985358. The cubic root of 51705387 is about 372.5448787572.

The spelling of 51705387 in words is "fifty-one million, seven hundred five thousand, three hundred eighty-seven".