128648632 has 16 divisors (see below), whose sum is σ = 275675760. Its totient is φ = 55135104.

The previous prime is 128648621. The next prime is 128648633. The reversal of 128648632 is 236846821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128648633) 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, 1148593 + ... + 1148704.

It is an arithmetic number, because the mean of its divisors is an integer number (17229735).

Almost surely, 2^128648632 is an apocalyptic number.

It is an amenable number.

128648632 is an abundant number, since it is smaller than the sum of its proper divisors (147027128).

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

128648632 is a wasteful number, since it uses less digits than its factorization.

128648632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2297310 (or 2297306 counting only the distinct ones).

The product of its digits is 110592, while the sum is 40.

The square root of 128648632 is about 11342.3380305826. The cubic root of 128648632 is about 504.8182622196.

The spelling of 128648632 in words is "one hundred twenty-eight million, six hundred forty-eight thousand, six hundred thirty-two".