263261540 has 24 divisors (see below), whose sum is σ = 562222080. Its totient is φ = 103519328.

The previous prime is 263261527. The next prime is 263261563. The reversal of 263261540 is 45162362.

263261540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110372 + ... + 112731.

It is an arithmetic number, because the mean of its divisors is an integer number (23425920).

Almost surely, 2^263261540 is an apocalyptic number.

263261540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

263261540 is an abundant number, since it is smaller than the sum of its proper divisors (298960540).

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

263261540 is a wasteful number, since it uses less digits than its factorization.

263261540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223171 (or 223169 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 263261540 is about 16225.3363601498. The cubic root of 263261540 is about 640.9081670715.

The spelling of 263261540 in words is "two hundred sixty-three million, two hundred sixty-one thousand, five hundred forty".