51864530 has 8 divisors (see below), whose sum is σ = 93356172. Its totient is φ = 20745808.

The previous prime is 51864521. The next prime is 51864551. The reversal of 51864530 is 3546815.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 50140561 + 1723969 = 7081^2 + 1313^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2593217 + ... + 2593236.

Almost surely, 2^51864530 is an apocalyptic number.

51864530 is a deficient number, since it is larger than the sum of its proper divisors (41491642).

51864530 is a wasteful number, since it uses less digits than its factorization.

51864530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5186460.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 51864530 is about 7201.7032707548. The cubic root of 51864530 is about 372.9267034879.

The spelling of 51864530 in words is "fifty-one million, eight hundred sixty-four thousand, five hundred thirty".