258046640 has 40 divisors (see below), whose sum is σ = 620652240. Its totient is φ = 99658496.

The previous prime is 258046639. The next prime is 258046643. The reversal of 258046640 is 46640852.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 258046640.

It is not an unprimeable number, because it can be changed into a prime (258046643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53294 + ... + 57933.

It is an arithmetic number, because the mean of its divisors is an integer number (15516306).

Almost surely, 2^258046640 is an apocalyptic number.

258046640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

258046640 is an abundant number, since it is smaller than the sum of its proper divisors (362605600).

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

258046640 is a wasteful number, since it uses less digits than its factorization.

258046640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111269 (or 111263 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 35.

The square root of 258046640 is about 16063.8301783852. The cubic root of 258046640 is about 636.6480348095.

The spelling of 258046640 in words is "two hundred fifty-eight million, forty-six thousand, six hundred forty".