51893865 has 56 divisors (see below), whose sum is σ = 97583040. Its totient is φ = 26430624.

The previous prime is 51893861. The next prime is 51893873. The reversal of 51893865 is 56839815.

It is not a de Polignac number, because 51893865 - 2² = 51893861 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 51893865.

It is not an unprimeable number, because it can be changed into a prime (51893861) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 83526 + ... + 84144.

Almost surely, 2^51893865 is an apocalyptic number.

It is an amenable number.

51893865 is a deficient number, since it is larger than the sum of its proper divisors (45689175).

51893865 is an equidigital number, since it uses as much as digits as its factorization.

51893865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665 (or 650 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 51893865 is about 7203.7396538187. The cubic root of 51893865 is about 372.9970003616.

The spelling of 51893865 in words is "fifty-one million, eight hundred ninety-three thousand, eight hundred sixty-five".