128763636 has 12 divisors (see below), whose sum is σ = 300448512. Its totient is φ = 42921208.

The previous prime is 128763631. The next prime is 128763653. The reversal of 128763636 is 636367821.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128763631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5365140 + ... + 5365163.

It is an arithmetic number, because the mean of its divisors is an integer number (25037376).

Almost surely, 2^128763636 is an apocalyptic number.

It is an amenable number.

128763636 is an abundant number, since it is smaller than the sum of its proper divisors (171684876).

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

128763636 is a wasteful number, since it uses less digits than its factorization.

128763636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10730310 (or 10730308 counting only the distinct ones).

The product of its digits is 217728, while the sum is 42.

The square root of 128763636 is about 11347.4065759538. The cubic root of 128763636 is about 504.9686429571.

The spelling of 128763636 in words is "one hundred twenty-eight million, seven hundred sixty-three thousand, six hundred thirty-six".