51678868 has 6 divisors (see below), whose sum is σ = 90438026. Its totient is φ = 25839432.

The previous prime is 51678857. The next prime is 51678883. The reversal of 51678868 is 86887615.

It can be written as a sum of positive squares in only one way, i.e., 38588944 + 13089924 = 6212^2 + 3618^2 .

It is a super-2 number, since 2×51678868² = 5341410795522848, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6459855 + ... + 6459862.

Almost surely, 2^51678868 is an apocalyptic number.

It is an amenable number.

51678868 is a deficient number, since it is larger than the sum of its proper divisors (38759158).

51678868 is a wasteful number, since it uses less digits than its factorization.

51678868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12919721 (or 12919719 counting only the distinct ones).

The product of its digits is 645120, while the sum is 49.

The square root of 51678868 is about 7188.8015691073. The cubic root of 51678868 is about 372.4811767736.

The spelling of 51678868 in words is "fifty-one million, six hundred seventy-eight thousand, eight hundred sixty-eight".