258378018 has 16 divisors (see below), whose sum is σ = 519355200. Its totient is φ = 85692816.

The previous prime is 258378011. The next prime is 258378031. The reversal of 258378018 is 810873852.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (258378011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107005 + ... + 109392.

It is an arithmetic number, because the mean of its divisors is an integer number (32459700).

Almost surely, 2^258378018 is an apocalyptic number.

258378018 is an abundant number, since it is smaller than the sum of its proper divisors (260977182).

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

258378018 is a wasteful number, since it uses less digits than its factorization.

258378018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216601.

The product of its (nonzero) digits is 107520, while the sum is 42.

The square root of 258378018 is about 16074.1412834403. The cubic root of 258378018 is about 636.9204415195.

It can be divided in two parts, 2583 and 78018, that added together give a triangular number (80601 = T₄₀₁).

The spelling of 258378018 in words is "two hundred fifty-eight million, three hundred seventy-eight thousand, eighteen".