258636640 has 48 divisors (see below), whose sum is σ = 646978752. Its totient is φ = 97368064.

The previous prime is 258636593. The next prime is 258636641. The reversal of 258636640 is 46636852.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 258636593 and 258636602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (258636641) 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, 44824 + ... + 50263.

It is an arithmetic number, because the mean of its divisors is an integer number (13478724).

Almost surely, 2^258636640 is an apocalyptic number.

258636640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

258636640 is an abundant number, since it is smaller than the sum of its proper divisors (388342112).

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

258636640 is a wasteful number, since it uses less digits than its factorization.

258636640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95119 (or 95111 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 40.

The square root of 258636640 is about 16082.1839312949. The cubic root of 258636640 is about 637.1328779478.

The spelling of 258636640 in words is "two hundred fifty-eight million, six hundred thirty-six thousand, six hundred forty".