258639640 has 48 divisors (see below), whose sum is σ = 676954800. Its totient is φ = 88675776.

The previous prime is 258639617. The next prime is 258639653. The reversal of 258639640 is 46936852.

258639640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64020 + ... + 67939.

It is an arithmetic number, because the mean of its divisors is an integer number (14103225).

Almost surely, 2^258639640 is an apocalyptic number.

258639640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

258639640 is an abundant number, since it is smaller than the sum of its proper divisors (418315160).

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

258639640 is a wasteful number, since it uses less digits than its factorization.

258639640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131984 (or 131973 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 43.

The square root of 258639640 is about 16082.2772019388. The cubic root of 258639640 is about 637.1353413668.

The spelling of 258639640 in words is "two hundred fifty-eight million, six hundred thirty-nine thousand, six hundred forty".