258218478 has 48 divisors (see below), whose sum is σ = 647127936. Its totient is φ = 72884880.

The previous prime is 258218473. The next prime is 258218479. The reversal of 258218478 is 874812852.

It is a happy number.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (258218473) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1888 + ... + 22803.

It is an arithmetic number, because the mean of its divisors is an integer number (13481832).

Almost surely, 2^258218478 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 258218478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (323563968).

258218478 is an abundant number, since it is smaller than the sum of its proper divisors (388909458).

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

258218478 is a wasteful number, since it uses less digits than its factorization.

258218478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24789 (or 24786 counting only the distinct ones).

The product of its digits is 286720, while the sum is 45.

The square root of 258218478 is about 16069.1778881186. The cubic root of 258218478 is about 636.7893219945.

The spelling of 258218478 in words is "two hundred fifty-eight million, two hundred eighteen thousand, four hundred seventy-eight".