51864285 has 16 divisors (see below), whose sum is σ = 90527040. Its totient is φ = 25146240.

The previous prime is 51864277. The next prime is 51864289. The reversal of 51864285 is 58246815.

It is not a de Polignac number, because 51864285 - 2³ = 51864277 is a prime.

It is a super-2 number, since 2×51864285² = 5379808117122450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51864289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157000 + ... + 157329.

It is an arithmetic number, because the mean of its divisors is an integer number (5657940).

Almost surely, 2^51864285 is an apocalyptic number.

51864285 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51864285 is a deficient number, since it is larger than the sum of its proper divisors (38662755).

51864285 is a wasteful number, since it uses less digits than its factorization.

51864285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314348.

The product of its digits is 76800, while the sum is 39.

The square root of 51864285 is about 7201.6862608697. The cubic root of 51864285 is about 372.9261162710.

The spelling of 51864285 in words is "fifty-one million, eight hundred sixty-four thousand, two hundred eighty-five".