51278480 has 40 divisors (see below), whose sum is σ = 130063104. Its totient is φ = 18646400.

The previous prime is 51278453. The next prime is 51278527. The reversal of 51278480 is 8487215.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×51278480² = 5258965022220800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51278480.

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 in 7 ways as a sum of consecutive naturals, for example, 28256 + ... + 30015.

Almost surely, 2^51278480 is an apocalyptic number.

It is an amenable number.

51278480 is an abundant number, since it is smaller than the sum of its proper divisors (78784624).

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

51278480 is a wasteful number, since it uses less digits than its factorization.

51278480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58295 (or 58289 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 51278480 is about 7160.8993848538. The cubic root of 51278480 is about 371.5167347775.

The spelling of 51278480 in words is "fifty-one million, two hundred seventy-eight thousand, four hundred eighty".