128309832 has 168 divisors, whose sum is σ = 420531750. Its totient is φ = 36578304.

The previous prime is 128309809. The next prime is 128309849. The reversal of 128309832 is 238903821.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 104162436 + 24147396 = 10206^2 + 4914^2 .

It is a tau number, because it is divible by the number of its divisors (168).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 285544 + ... + 285992.

Almost surely, 2^128309832 is an apocalyptic number.

128309832 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 128309832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (210265875).

128309832 is an abundant number, since it is smaller than the sum of its proper divisors (292221918).

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

128309832 is an equidigital number, since it uses as much as digits as its factorization.

128309832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487 (or 461 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 128309832 is about 11327.3929922114. The cubic root of 128309832 is about 504.3747213276.

The spelling of 128309832 in words is "one hundred twenty-eight million, three hundred nine thousand, eight hundred thirty-two".