263857664 has 80 divisors (see below), whose sum is σ = 610460928. Its totient is φ = 111593472.

The previous prime is 263857661. The next prime is 263857667. The reversal of 263857664 is 466758362.

It is an interprime number because it is at equal distance from previous prime (263857661) and next prime (263857667).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263857661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 297029 + ... + 297915.

Almost surely, 2^263857664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 263857664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (305230464).

263857664 is an abundant number, since it is smaller than the sum of its proper divisors (346603264).

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

263857664 is an frugal number, since it uses more digits than its factorization.

263857664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 995 (or 979 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 47.

The square root of 263857664 is about 16243.6961311150. The cubic root of 263857664 is about 641.3915554738.

The spelling of 263857664 in words is "two hundred sixty-three million, eight hundred fifty-seven thousand, six hundred sixty-four".