258991278 has 32 divisors (see below), whose sum is σ = 637518336. Its totient is φ = 68305248.

The previous prime is 258991273. The next prime is 258991283. The reversal of 258991278 is 872199852.

It is an interprime number because it is at equal distance from previous prime (258991273) and next prime (258991283).

It is a self number, because there is not a number n which added to its sum of digits gives 258991278.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (258991273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 236626 + ... + 237717.

It is an arithmetic number, because the mean of its divisors is an integer number (19922448).

Almost surely, 2^258991278 is an apocalyptic number.

258991278 is an abundant number, since it is smaller than the sum of its proper divisors (378527058).

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

258991278 is a wasteful number, since it uses less digits than its factorization.

258991278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474368.

The product of its digits is 725760, while the sum is 51.

The square root of 258991278 is about 16093.2059577947. The cubic root of 258991278 is about 637.4239534048.

The spelling of 258991278 in words is "two hundred fifty-eight million, nine hundred ninety-one thousand, two hundred seventy-eight".