258381018 has 72 divisors (see below), whose sum is σ = 660311028. Its totient is φ = 72793728.

The previous prime is 258380971. The next prime is 258381029. The reversal of 258381018 is 810183852.

It can be written as a sum of positive squares in 2 ways, for example, as 246081969 + 12299049 = 15687^2 + 3507^2 .

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 62380 + ... + 66392.

Almost surely, 2^258381018 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 258381018, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (330155514).

258381018 is an abundant number, since it is smaller than the sum of its proper divisors (401930010).

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

258381018 is a wasteful number, since it uses less digits than its factorization.

258381018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4108 (or 4098 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The square root of 258381018 is about 16074.2346007516. The cubic root of 258381018 is about 636.9229065820.

The spelling of 258381018 in words is "two hundred fifty-eight million, three hundred eighty-one thousand, eighteen".