128257932 has 24 divisors (see below), whose sum is σ = 326475072. Its totient is φ = 38866000.

The previous prime is 128257931. The next prime is 128257939. The reversal of 128257932 is 239752821.

It is not an unprimeable number, because it can be changed into a prime (128257931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 485694 + ... + 485957.

It is an arithmetic number, because the mean of its divisors is an integer number (13603128).

Almost surely, 2^128257932 is an apocalyptic number.

128257932 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128257932 is an abundant number, since it is smaller than the sum of its proper divisors (198217140).

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

128257932 is a wasteful number, since it uses less digits than its factorization.

128257932 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971669 (or 971667 counting only the distinct ones).

The product of its digits is 60480, while the sum is 39.

The square root of 128257932 is about 11325.1018538466. The cubic root of 128257932 is about 504.3067073704.

The spelling of 128257932 in words is "one hundred twenty-eight million, two hundred fifty-seven thousand, nine hundred thirty-two".