268640523 has 16 divisors (see below), whose sum is σ = 404512800. Its totient is φ = 176156640.

The previous prime is 268640503. The next prime is 268640557. The reversal of 268640523 is 325046862.

268640523 is a `hidden beast` number, since 2 + 6 + 8 + 640 + 5 + 2 + 3 = 666.

It is not a de Polignac number, because 268640523 - 2⁶ = 268640459 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (268640503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79908 + ... + 83201.

It is an arithmetic number, because the mean of its divisors is an integer number (25282050).

Almost surely, 2^268640523 is an apocalyptic number.

268640523 is a deficient number, since it is larger than the sum of its proper divisors (135872277).

268640523 is a wasteful number, since it uses less digits than its factorization.

268640523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163179 (or 163173 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 268640523 is about 16390.2569534465. The cubic root of 268640523 is about 645.2438018311.

The spelling of 268640523 in words is "two hundred sixty-eight million, six hundred forty thousand, five hundred twenty-three".