258666816 has 28 divisors (see below), whose sum is σ = 684389792. Its totient is φ = 86222208.

The previous prime is 258666791. The next prime is 258666851. The reversal of 258666816 is 618666852.

It is a happy number.

258666816 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent 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, 673420 + ... + 673803.

Almost surely, 2^258666816 is an apocalyptic number.

It is an amenable number.

258666816 is an abundant number, since it is smaller than the sum of its proper divisors (425722976).

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

258666816 is a wasteful number, since it uses less digits than its factorization.

258666816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1347238 (or 1347228 counting only the distinct ones).

The product of its digits is 829440, while the sum is 48.

The square root of 258666816 is about 16083.1220849685. The cubic root of 258666816 is about 637.1576557906.

The spelling of 258666816 in words is "two hundred fifty-eight million, six hundred sixty-six thousand, eight hundred sixteen".