51647280 has 40 divisors (see below), whose sum is σ = 160107312. Its totient is φ = 13772544.

The previous prime is 51647269. The next prime is 51647287. The reversal of 51647280 is 8274615.

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

It is not an unprimeable number, because it can be changed into a prime (51647287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107359 + ... + 107838.

Almost surely, 2^51647280 is an apocalyptic number.

It is an amenable number.

51647280 is an abundant number, since it is smaller than the sum of its proper divisors (108460032).

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

51647280 is a wasteful number, since it uses less digits than its factorization.

51647280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215213 (or 215207 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 51647280 is about 7186.6042050471. The cubic root of 51647280 is about 372.4052699672.

The spelling of 51647280 in words is "fifty-one million, six hundred forty-seven thousand, two hundred eighty".