128433860 has 24 divisors (see below), whose sum is σ = 270682776. Its totient is φ = 51188480.

The previous prime is 128433859. The next prime is 128433869. The reversal of 128433860 is 68334821.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6728836 + 121705024 = 2594^2 + 11032^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 128433860.

It is not an unprimeable number, because it can be changed into a prime (128433869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5807 + ... + 17046.

It is an arithmetic number, because the mean of its divisors is an integer number (11278449).

Almost surely, 2^128433860 is an apocalyptic number.

128433860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128433860 is an abundant number, since it is smaller than the sum of its proper divisors (142248916).

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

128433860 is a wasteful number, since it uses less digits than its factorization.

128433860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23143 (or 23141 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 128433860 is about 11332.8663629287. The cubic root of 128433860 is about 504.5371833968.

The spelling of 128433860 in words is "one hundred twenty-eight million, four hundred thirty-three thousand, eight hundred sixty".