258306987 has 4 divisors (see below), whose sum is σ = 344409320. Its totient is φ = 172204656.

The previous prime is 258306967. The next prime is 258306989. The reversal of 258306987 is 789603852.

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

It is not a de Polignac number, because 258306987 - 2¹⁰ = 258305963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (258306989) 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, 43051162 + ... + 43051167.

It is an arithmetic number, because the mean of its divisors is an integer number (86102330).

Almost surely, 2^258306987 is an apocalyptic number.

258306987 is a deficient number, since it is larger than the sum of its proper divisors (86102333).

258306987 is an equidigital number, since it uses as much as digits as its factorization.

258306987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86102332.

The product of its (nonzero) digits is 725760, while the sum is 48.

The square root of 258306987 is about 16071.9316511737. The cubic root of 258306987 is about 636.8620706583.

The spelling of 258306987 in words is "two hundred fifty-eight million, three hundred six thousand, nine hundred eighty-seven".