51278808 has 32 divisors (see below), whose sum is σ = 146511360. Its totient is φ = 14651040.

The previous prime is 51278791. The next prime is 51278813. The reversal of 51278808 is 80887215.

It is a super-2 number, since 2×51278808² = 5259032299801728, 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 7 ways as a sum of consecutive naturals, for example, 152448 + ... + 152783.

It is an arithmetic number, because the mean of its divisors is an integer number (4578480).

Almost surely, 2^51278808 is an apocalyptic number.

It is an amenable number.

51278808 is an abundant number, since it is smaller than the sum of its proper divisors (95232552).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51278808 is a wasteful number, since it uses less digits than its factorization.

51278808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305247 (or 305243 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 39.

The square root of 51278808 is about 7160.9222869683. The cubic root of 51278808 is about 371.5175269046.

The spelling of 51278808 in words is "fifty-one million, two hundred seventy-eight thousand, eight hundred eight".