258782868 has 18 divisors (see below), whose sum is σ = 654145674. Its totient is φ = 86260944.

The previous prime is 258782861. The next prime is 258782879. The reversal of 258782868 is 868287852.

It can be written as a sum of positive squares in only one way, i.e., 159820164 + 98962704 = 12642^2 + 9948^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (258782861) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3594171 + ... + 3594242.

Almost surely, 2^258782868 is an apocalyptic number.

It is an amenable number.

258782868 is an abundant number, since it is smaller than the sum of its proper divisors (395362806).

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

258782868 is a wasteful number, since it uses less digits than its factorization.

258782868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7188423 (or 7188418 counting only the distinct ones).

The product of its digits is 3440640, while the sum is 54.

The square root of 258782868 is about 16086.7295619713. The cubic root of 258782868 is about 637.2529294014.

It can be divided in two parts, 258 and 782868, that added together give a triangular number (783126 = T₁₂₅₁).

The spelling of 258782868 in words is "two hundred fifty-eight million, seven hundred eighty-two thousand, eight hundred sixty-eight".