263626128728 has 8 divisors (see below), whose sum is σ = 494298991380. Its totient is φ = 131813064360.

The previous prime is 263626128721. The next prime is 263626128793. The reversal of 263626128728 is 827821626362.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×263626128728² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 263626128728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263626128721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16476633038 + ... + 16476633053.

Almost surely, 2^263626128728 is an apocalyptic number.

It is an amenable number.

263626128728 is a deficient number, since it is larger than the sum of its proper divisors (230672862652).

263626128728 is a wasteful number, since it uses less digits than its factorization.

263626128728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32953266097 (or 32953266093 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 53.

The spelling of 263626128728 in words is "two hundred sixty-three billion, six hundred twenty-six million, one hundred twenty-eight thousand, seven hundred twenty-eight".