258138478 has 8 divisors (see below), whose sum is σ = 416992968. Its totient is φ = 119140824.

The previous prime is 258138473. The next prime is 258138479. The reversal of 258138478 is 874831852.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (258138473) 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, 4964176 + ... + 4964227.

It is an arithmetic number, because the mean of its divisors is an integer number (52124121).

Almost surely, 2^258138478 is an apocalyptic number.

258138478 is a deficient number, since it is larger than the sum of its proper divisors (158854490).

258138478 is a wasteful number, since it uses less digits than its factorization.

258138478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9928418.

The product of its digits is 430080, while the sum is 46.

The square root of 258138478 is about 16066.6884577999. The cubic root of 258138478 is about 636.7235528726.

The spelling of 258138478 in words is "two hundred fifty-eight million, one hundred thirty-eight thousand, four hundred seventy-eight".