128578632 has 128 divisors (see below), whose sum is σ = 399893760. Its totient is φ = 33546240.

The previous prime is 128578627. The next prime is 128578649. The reversal of 128578632 is 236875821.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 246532 + ... + 247052.

It is an arithmetic number, because the mean of its divisors is an integer number (3124170).

Almost surely, 2^128578632 is an apocalyptic number.

128578632 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128578632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199946880).

128578632 is an abundant number, since it is smaller than the sum of its proper divisors (271315128).

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

128578632 is a wasteful number, since it uses less digits than its factorization.

128578632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663 (or 659 counting only the distinct ones).

The product of its digits is 161280, while the sum is 42.

The square root of 128578632 is about 11339.2518271710. The cubic root of 128578632 is about 504.7266854212.

The spelling of 128578632 in words is "one hundred twenty-eight million, five hundred seventy-eight thousand, six hundred thirty-two".