263645920 has 48 divisors (see below), whose sum is σ = 623872368. Its totient is φ = 105287680.

The previous prime is 263645839. The next prime is 263645923. The reversal of 263645920 is 29546362.

It is a super-2 number, since 2×263645920² = 139018342265292800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 263645920.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263645923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154512 + ... + 156208.

It is an arithmetic number, because the mean of its divisors is an integer number (12997341).

Almost surely, 2^263645920 is an apocalyptic number.

263645920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

263645920 is an abundant number, since it is smaller than the sum of its proper divisors (360226448).

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

263645920 is a wasteful number, since it uses less digits than its factorization.

263645920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2683 (or 2675 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 263645920 is about 16237.1770945568. The cubic root of 263645920 is about 641.2199387560.

The spelling of 263645920 in words is "two hundred sixty-three million, six hundred forty-five thousand, nine hundred twenty".