51287208 has 32 divisors (see below), whose sum is σ = 146535360. Its totient is φ = 14653440.

The previous prime is 51287191. The next prime is 51287209. The reversal of 51287208 is 80278215.

It is not an unprimeable number, because it can be changed into a prime (51287209) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 152473 + ... + 152808.

It is an arithmetic number, because the mean of its divisors is an integer number (4579230).

Almost surely, 2^51287208 is an apocalyptic number.

It is an amenable number.

51287208 is an abundant number, since it is smaller than the sum of its proper divisors (95248152).

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

51287208 is a wasteful number, since it uses less digits than its factorization.

51287208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305297 (or 305293 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 51287208 is about 7161.5087795799. The cubic root of 51287208 is about 371.5378119370.

The spelling of 51287208 in words is "fifty-one million, two hundred eighty-seven thousand, two hundred eight".