258440064 has 64 divisors (see below), whose sum is σ = 689124240. Its totient is φ = 85815296.

The previous prime is 258440057. The next prime is 258440093. The reversal of 258440064 is 460044852.

It is a tau number, because it is divible by the number of its divisors (64).

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, 111364 + ... + 113660.

Almost surely, 2^258440064 is an apocalyptic number.

258440064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 258440064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (344562120).

258440064 is an abundant number, since it is smaller than the sum of its proper divisors (430684176).

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

258440064 is a wasteful number, since it uses less digits than its factorization.

258440064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2607 (or 2595 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 33.

The square root of 258440064 is about 16076.0711618231. The cubic root of 258440064 is about 636.9714200601.

The spelling of 258440064 in words is "two hundred fifty-eight million, four hundred forty thousand, sixty-four".