263128404 has 96 divisors (see below), whose sum is σ = 769499136. Its totient is φ = 67985280.

The previous prime is 263128391. The next prime is 263128421. The reversal of 263128404 is 404821362.

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, 205414 + ... + 206690.

It is an arithmetic number, because the mean of its divisors is an integer number (8015616).

Almost surely, 2^263128404 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 263128404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (384749568).

263128404 is an abundant number, since it is smaller than the sum of its proper divisors (506370732).

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

263128404 is a wasteful number, since it uses less digits than its factorization.

263128404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1525 (or 1523 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 263128404 is about 16221.2331220533. The cubic root of 263128404 is about 640.8001093358.

Adding to 263128404 its reverse (404821362), we get a palindrome (667949766).

It can be divided in two parts, 26312 and 8404, that added together give a triangular number (34716 = T₂₆₃).

The spelling of 263128404 in words is "two hundred sixty-three million, one hundred twenty-eight thousand, four hundred four".