263540064 has 24 divisors (see below), whose sum is σ = 691792920. Its totient is φ = 87846656.

The previous prime is 263540059. The next prime is 263540117. The reversal of 263540064 is 460045362.

It is a tau number, because it is divible by the number of its divisors (24).

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, 1372509 + ... + 1372700.

It is an arithmetic number, because the mean of its divisors is an integer number (28824705).

Almost surely, 2^263540064 is an apocalyptic number.

263540064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

263540064 is an abundant number, since it is smaller than the sum of its proper divisors (428252856).

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

263540064 is a wasteful number, since it uses less digits than its factorization.

263540064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2745222 (or 2745214 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 263540064 is about 16233.9170873822. The cubic root of 263540064 is about 641.1341089124.

The spelling of 263540064 in words is "two hundred sixty-three million, five hundred forty thousand, sixty-four".