51287278 has 8 divisors (see below), whose sum is σ = 87921072. Its totient is φ = 21980256.

The previous prime is 51287233. The next prime is 51287279. The reversal of 51287278 is 87278215.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 51287278.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51287279) 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, 1831675 + ... + 1831702.

It is an arithmetic number, because the mean of its divisors is an integer number (10990134).

Almost surely, 2^51287278 is an apocalyptic number.

51287278 is a deficient number, since it is larger than the sum of its proper divisors (36633794).

51287278 is a wasteful number, since it uses less digits than its factorization.

51287278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3663386.

The product of its digits is 62720, while the sum is 40.

The square root of 51287278 is about 7161.5136668165. The cubic root of 51287278 is about 371.5379809696.

The spelling of 51287278 in words is "fifty-one million, two hundred eighty-seven thousand, two hundred seventy-eight".