51917864 has 16 divisors (see below), whose sum is σ = 103072500. Its totient is φ = 24431872.

The previous prime is 51917857. The next prime is 51917869. The reversal of 51917864 is 46871915.

It can be written as a sum of positive squares in 2 ways, for example, as 49815364 + 2102500 = 7058^2 + 1450^2 .

It is not an unprimeable number, because it can be changed into a prime (51917869) 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, 190739 + ... + 191010.

Almost surely, 2^51917864 is an apocalyptic number.

It is an amenable number.

51917864 is a deficient number, since it is larger than the sum of its proper divisors (51154636).

51917864 is a wasteful number, since it uses less digits than its factorization.

51917864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381772 (or 381768 counting only the distinct ones).

The product of its digits is 60480, while the sum is 41.

The square root of 51917864 is about 7205.4051933254. The cubic root of 51917864 is about 373.0544906221.

The spelling of 51917864 in words is "fifty-one million, nine hundred seventeen thousand, eight hundred sixty-four".