262640128 has 40 divisors (see below), whose sum is σ = 547607808. Its totient is φ = 125604864.

The previous prime is 262640111. The next prime is 262640149. The reversal of 262640128 is 821046262.

It is a self number, because there is not a number n which added to its sum of digits gives 262640128.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 625 + ... + 22927.

Almost surely, 2^262640128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 262640128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273803904).

262640128 is an abundant number, since it is smaller than the sum of its proper divisors (284967680).

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

262640128 is an equidigital number, since it uses as much as digits as its factorization.

262640128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22344 (or 22328 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 262640128 is about 16206.1756130186. The cubic root of 262640128 is about 640.4034955580.

The spelling of 262640128 in words is "two hundred sixty-two million, six hundred forty thousand, one hundred twenty-eight".