51285280 has 24 divisors (see below), whose sum is σ = 121161852. Its totient is φ = 20514048.

The previous prime is 51285259. The next prime is 51285343. The reversal of 51285280 is 8258215.

It can be written as a sum of positive squares in 2 ways, for example, as 48608784 + 2676496 = 6972^2 + 1636^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

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, 160107 + ... + 160426.

Almost surely, 2^51285280 is an apocalyptic number.

It is an amenable number.

51285280 is an abundant number, since it is smaller than the sum of its proper divisors (69876572).

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

51285280 is a wasteful number, since it uses less digits than its factorization.

51285280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320548 (or 320540 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 31.

The square root of 51285280 is about 7161.3741698085. The cubic root of 51285280 is about 371.5331562349.

The spelling of 51285280 in words is "fifty-one million, two hundred eighty-five thousand, two hundred eighty".