51473680 has 20 divisors (see below), whose sum is σ = 119676492. Its totient is φ = 20589440.

The previous prime is 51473677. The next prime is 51473693. The reversal of 51473680 is 8637415.

It can be written as a sum of positive squares in 2 ways, for example, as 33223696 + 18249984 = 5764^2 + 4272^2 .

It is a tau number, because it is divible by the number of its divisors (20).

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, 321631 + ... + 321790.

Almost surely, 2^51473680 is an apocalyptic number.

It is an amenable number.

51473680 is an abundant number, since it is smaller than the sum of its proper divisors (68202812).

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

51473680 is a wasteful number, since it uses less digits than its factorization.

51473680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643434 (or 643428 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 51473680 is about 7174.5160115509. The cubic root of 51473680 is about 371.9875511308.

The spelling of 51473680 in words is "fifty-one million, four hundred seventy-three thousand, six hundred eighty".