263561628 has 96 divisors (see below), whose sum is σ = 716728320. Its totient is φ = 74592000.

The previous prime is 263561587. The next prime is 263561671. The reversal of 263561628 is 826165362.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 117558 + ... + 119778.

It is an arithmetic number, because the mean of its divisors is an integer number (7465920).

Almost surely, 2^263561628 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 263561628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (358364160).

263561628 is an abundant number, since it is smaller than the sum of its proper divisors (453166692).

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

263561628 is a wasteful number, since it uses less digits than its factorization.

263561628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2299 (or 2297 counting only the distinct ones).

The product of its digits is 103680, while the sum is 39.

The square root of 263561628 is about 16234.5812388247. The cubic root of 263561628 is about 641.1515952338.

The spelling of 263561628 in words is "two hundred sixty-three million, five hundred sixty-one thousand, six hundred twenty-eight".