128309828 has 24 divisors (see below), whose sum is σ = 230947584. Its totient is φ = 62337600.

The previous prime is 128309809. The next prime is 128309849. The reversal of 128309828 is 828903821.

It is a happy number.

It is a super-2 number, since 2×128309828² = 32926823922779168, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43001 + ... + 45887.

It is an arithmetic number, because the mean of its divisors is an integer number (9622816).

Almost surely, 2^128309828 is an apocalyptic number.

It is an amenable number.

128309828 is a deficient number, since it is larger than the sum of its proper divisors (102637756).

128309828 is a wasteful number, since it uses less digits than its factorization.

128309828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3203 (or 3201 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 41.

The square root of 128309828 is about 11327.3928156483. The cubic root of 128309828 is about 504.3747160864.

The spelling of 128309828 in words is "one hundred twenty-eight million, three hundred nine thousand, eight hundred twenty-eight".