263111240 has 128 divisors (see below), whose sum is σ = 719366400. Its totient is φ = 84837888.

The previous prime is 263111231. The next prime is 263111269. The reversal of 263111240 is 42111362.

263111240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×263111240² = 138455049228675200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1920452 + ... + 1920588.

It is an arithmetic number, because the mean of its divisors is an integer number (5620050).

Almost surely, 2^263111240 is an apocalyptic number.

263111240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 263111240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (359683200).

263111240 is an abundant number, since it is smaller than the sum of its proper divisors (456255160).

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

263111240 is a wasteful number, since it uses less digits than its factorization.

263111240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212 (or 170 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 263111240 is about 16220.7040537703. The cubic root of 263111240 is about 640.7861757936.

The spelling of 263111240 in words is "two hundred sixty-three million, one hundred eleven thousand, two hundred forty".