51866864 has 40 divisors (see below), whose sum is σ = 121608288. Its totient is φ = 20920320.

The previous prime is 51866831. The next prime is 51866869. The reversal of 51866864 is 46866815.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51866869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11717 + ... + 15524.

Almost surely, 2^51866864 is an apocalyptic number.

It is an amenable number.

51866864 is an abundant number, since it is smaller than the sum of its proper divisors (69741424).

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

51866864 is a wasteful number, since it uses less digits than its factorization.

51866864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27273 (or 27267 counting only the distinct ones).

The product of its digits is 276480, while the sum is 44.

The square root of 51866864 is about 7201.8653139308. The cubic root of 51866864 is about 372.9322975350.

The spelling of 51866864 in words is "fifty-one million, eight hundred sixty-six thousand, eight hundred sixty-four".