128772632 has 8 divisors (see below), whose sum is σ = 241448700. Its totient is φ = 64386312.

The previous prime is 128772619. The next prime is 128772661. The reversal of 128772632 is 236277821.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8048282 + ... + 8048297.

Almost surely, 2^128772632 is an apocalyptic number.

It is an amenable number.

128772632 is a deficient number, since it is larger than the sum of its proper divisors (112676068).

128772632 is a wasteful number, since it uses less digits than its factorization.

128772632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16096585 (or 16096581 counting only the distinct ones).

The product of its digits is 56448, while the sum is 38.

The square root of 128772632 is about 11347.8029591635. The cubic root of 128772632 is about 504.9804024679.

The spelling of 128772632 in words is "one hundred twenty-eight million, seven hundred seventy-two thousand, six hundred thirty-two".