263640388 has 12 divisors (see below), whose sum is σ = 503313552. Its totient is φ = 119836520.

The previous prime is 263640383. The next prime is 263640397. The reversal of 263640388 is 883046362.

263640388 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 263640388.

It is not an unprimeable number, because it can be changed into a prime (263640383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2995870 + ... + 2995957.

It is an arithmetic number, because the mean of its divisors is an integer number (41942796).

Almost surely, 2^263640388 is an apocalyptic number.

It is an amenable number.

263640388 is a deficient number, since it is larger than the sum of its proper divisors (239673164).

263640388 is a wasteful number, since it uses less digits than its factorization.

263640388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5991842 (or 5991840 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 40.

The square root of 263640388 is about 16237.0067438552. The cubic root of 263640388 is about 641.2154538854.

The spelling of 263640388 in words is "two hundred sixty-three million, six hundred forty thousand, three hundred eighty-eight".