51872865 has 32 divisors (see below), whose sum is σ = 95872896. Its totient is φ = 23669760.

The previous prime is 51872861. The next prime is 51872897. The reversal of 51872865 is 56827815.

It is not a de Polignac number, because 51872865 - 2² = 51872861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51872861) 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 31 ways as a sum of consecutive naturals, for example, 6442 + ... + 12051.

It is an arithmetic number, because the mean of its divisors is an integer number (2996028).

Almost surely, 2^51872865 is an apocalyptic number.

51872865 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51872865 is a deficient number, since it is larger than the sum of its proper divisors (44000031).

51872865 is a wasteful number, since it uses less digits than its factorization.

51872865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18529.

The product of its digits is 134400, while the sum is 42.

The square root of 51872865 is about 7202.2819300552. The cubic root of 51872865 is about 372.9466797451.

The spelling of 51872865 in words is "fifty-one million, eight hundred seventy-two thousand, eight hundred sixty-five".