51378868 has 12 divisors (see below), whose sum is σ = 89964000. Its totient is φ = 25674872.

The previous prime is 51378853. The next prime is 51378881. The reversal of 51378868 is 86887315.

It is a super-2 number, since 2×51378868² = 5279576153922848, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9855 + ... + 14137.

It is an arithmetic number, because the mean of its divisors is an integer number (7497000).

Almost surely, 2^51378868 is an apocalyptic number.

It is an amenable number.

51378868 is a deficient number, since it is larger than the sum of its proper divisors (38585132).

51378868 is a wasteful number, since it uses less digits than its factorization.

51378868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7286 (or 7284 counting only the distinct ones).

The product of its digits is 322560, while the sum is 46.

The square root of 51378868 is about 7167.9054123223. The cubic root of 51378868 is about 371.7590164674.

The spelling of 51378868 in words is "fifty-one million, three hundred seventy-eight thousand, eight hundred sixty-eight".