258640815 has 8 divisors (see below), whose sum is σ = 413825328. Its totient is φ = 137941760.

The previous prime is 258640807. The next prime is 258640831. The reversal of 258640815 is 518046852.

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

It is not a de Polignac number, because 258640815 - 2³ = 258640807 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8621346 + ... + 8621375.

It is an arithmetic number, because the mean of its divisors is an integer number (51728166).

Almost surely, 2^258640815 is an apocalyptic number.

258640815 is a deficient number, since it is larger than the sum of its proper divisors (155184513).

258640815 is a wasteful number, since it uses less digits than its factorization.

258640815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17242729.

The product of its (nonzero) digits is 76800, while the sum is 39.

The square root of 258640815 is about 16082.3137327935. The cubic root of 258640815 is about 637.1363062007.

The spelling of 258640815 in words is "two hundred fifty-eight million, six hundred forty thousand, eight hundred fifteen".