51472840 has 16 divisors (see below), whose sum is σ = 115813980. Its totient is φ = 20589120.

The previous prime is 51472823. The next prime is 51472847. The reversal of 51472840 is 4827415.

It can be written as a sum of positive squares in 2 ways, for example, as 50722884 + 749956 = 7122^2 + 866^2 .

It is not an unprimeable number, because it can be changed into a prime (51472847) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 643371 + ... + 643450.

Almost surely, 2^51472840 is an apocalyptic number.

It is an amenable number.

51472840 is an abundant number, since it is smaller than the sum of its proper divisors (64341140).

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

51472840 is a wasteful number, since it uses less digits than its factorization.

51472840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286832 (or 1286828 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 51472840 is about 7174.4574707778. The cubic root of 51472840 is about 371.9855276291.

The spelling of 51472840 in words is "fifty-one million, four hundred seventy-two thousand, eight hundred forty".