263155640 has 48 divisors (see below), whose sum is σ = 650832840. Its totient is φ = 95691200.

The previous prime is 263155639. The next prime is 263155649. The reversal of 263155640 is 46551362.

It is a junction number, because it is equal to n+sod(n) for n = 263155597 and 263155606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263155649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22346 + ... + 32025.

Almost surely, 2^263155640 is an apocalyptic number.

263155640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

263155640 is an abundant number, since it is smaller than the sum of its proper divisors (387677200).

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

263155640 is a wasteful number, since it uses less digits than its factorization.

263155640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54404 (or 54389 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 263155640 is about 16222.0726172706. The cubic root of 263155640 is about 640.8222179710.

The spelling of 263155640 in words is "two hundred sixty-three million, one hundred fifty-five thousand, six hundred forty".