263878765 has 4 divisors (see below), whose sum is σ = 316654524. Its totient is φ = 211103008.

The previous prime is 263878759. The next prime is 263878781. The reversal of 263878765 is 567878362.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 198640836 + 65237929 = 14094^2 + 8077^2 .

It is a cyclic number.

It is not a de Polignac number, because 263878765 - 2¹³ = 263870573 is a prime.

It is a Duffinian number.

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, 26387872 + ... + 26387881.

It is an arithmetic number, because the mean of its divisors is an integer number (79163631).

Almost surely, 2^263878765 is an apocalyptic number.

It is an amenable number.

263878765 is a deficient number, since it is larger than the sum of its proper divisors (52775759).

263878765 is an equidigital number, since it uses as much as digits as its factorization.

263878765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52775758.

The product of its digits is 3386880, while the sum is 52.

The square root of 263878765 is about 16244.3456316344. The cubic root of 263878765 is about 641.4086526241.

The spelling of 263878765 in words is "two hundred sixty-three million, eight hundred seventy-eight thousand, seven hundred sixty-five".