263540634 has 32 divisors (see below), whose sum is σ = 607720320. Its totient is φ = 74629632.

The previous prime is 263540617. The next prime is 263540653. The reversal of 263540634 is 436045362.

It is a junction number, because it is equal to n+sod(n) for n = 263540595 and 263540604.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23019 + ... + 32510.

It is an arithmetic number, because the mean of its divisors is an integer number (18991260).

Almost surely, 2^263540634 is an apocalyptic number.

263540634 is an abundant number, since it is smaller than the sum of its proper divisors (344179686).

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

263540634 is a wasteful number, since it uses less digits than its factorization.

263540634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55654.

The product of its (nonzero) digits is 51840, while the sum is 33.

The square root of 263540634 is about 16233.9346432096. The cubic root of 263540634 is about 641.1345711396.

Adding to 263540634 its reverse (436045362), we get a palindrome (699585996).

The spelling of 263540634 in words is "two hundred sixty-three million, five hundred forty thousand, six hundred thirty-four".