263257840 has 20 divisors (see below), whose sum is σ = 612074664. Its totient is φ = 105303104.

The previous prime is 263257831. The next prime is 263257873. The reversal of 263257840 is 48752362.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 263257840.

It is a congruent number.

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, 1645282 + ... + 1645441.

Almost surely, 2^263257840 is an apocalyptic number.

263257840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

263257840 is an abundant number, since it is smaller than the sum of its proper divisors (348816824).

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

263257840 is a wasteful number, since it uses less digits than its factorization.

263257840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3290736 (or 3290730 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 263257840 is about 16225.2223405413. Note that the first 3 decimals coincide. The cubic root of 263257840 is about 640.9051645171.

The spelling of 263257840 in words is "two hundred sixty-three million, two hundred fifty-seven thousand, eight hundred forty".