128905263 has 20 divisors (see below), whose sum is σ = 192874968. Its totient is φ = 85797360.

The previous prime is 128905229. The next prime is 128905267. The reversal of 128905263 is 362509821.

128905263 is a `hidden beast` number, since 128 + 9 + 0 + 526 + 3 = 666.

It is not a de Polignac number, because 128905263 - 2⁶ = 128905199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128905267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 81268 + ... + 82838.

Almost surely, 2^128905263 is an apocalyptic number.

128905263 is a deficient number, since it is larger than the sum of its proper divisors (63969705).

128905263 is a wasteful number, since it uses less digits than its factorization.

128905263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2596 (or 2587 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 128905263 is about 11353.6453617329. The cubic root of 128905263 is about 505.1537132965.

The spelling of 128905263 in words is "one hundred twenty-eight million, nine hundred five thousand, two hundred sixty-three".