128199732 has 12 divisors (see below), whose sum is σ = 299132736. Its totient is φ = 42733240.

The previous prime is 128199697. The next prime is 128199733. The reversal of 128199732 is 237991821.

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 (128199733) 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, 5341644 + ... + 5341667.

It is an arithmetic number, because the mean of its divisors is an integer number (24927728).

Almost surely, 2^128199732 is an apocalyptic number.

128199732 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128199732 is an abundant number, since it is smaller than the sum of its proper divisors (170933004).

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

128199732 is a wasteful number, since it uses less digits than its factorization.

128199732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10683318 (or 10683316 counting only the distinct ones).

The product of its digits is 54432, while the sum is 42.

The square root of 128199732 is about 11322.5320489721. The cubic root of 128199732 is about 504.2304155561.

The spelling of 128199732 in words is "one hundred twenty-eight million, one hundred ninety-nine thousand, seven hundred thirty-two".