51731670 has 16 divisors (see below), whose sum is σ = 124156080. Its totient is φ = 13795104.

The previous prime is 51731633. The next prime is 51731707. The reversal of 51731670 is 7613715.

It is an interprime number because it is at equal distance from previous prime (51731633) and next prime (51731707).

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 1724389 = 51731670 / (5 + 1 + 7 + 3 + 1 + 6 + 7 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 862165 + ... + 862224.

It is an arithmetic number, because the mean of its divisors is an integer number (7759755).

Almost surely, 2^51731670 is an apocalyptic number.

51731670 is an abundant number, since it is smaller than the sum of its proper divisors (72424410).

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

51731670 is a wasteful number, since it uses less digits than its factorization.

51731670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1724399.

The product of its (nonzero) digits is 4410, while the sum is 30.

The square root of 51731670 is about 7192.4731490635. The cubic root of 51731670 is about 372.6079923513.

The spelling of 51731670 in words is "fifty-one million, seven hundred thirty-one thousand, six hundred seventy".