258784287 has 4 divisors (see below), whose sum is σ = 345045720. Its totient is φ = 172522856.

The previous prime is 258784231. The next prime is 258784297. The reversal of 258784287 is 782487852.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 258784287 - 2⁷ = 258784159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (258784297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43130712 + ... + 43130717.

It is an arithmetic number, because the mean of its divisors is an integer number (86261430).

Almost surely, 2^258784287 is an apocalyptic number.

258784287 is a deficient number, since it is larger than the sum of its proper divisors (86261433).

258784287 is an equidigital number, since it uses as much as digits as its factorization.

258784287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86261432.

The product of its digits is 2007040, while the sum is 51.

The square root of 258784287 is about 16086.7736665871. The cubic root of 258784287 is about 637.2540941620.

The spelling of 258784287 in words is "two hundred fifty-eight million, seven hundred eighty-four thousand, two hundred eighty-seven".