128322999 has 24 divisors (see below), whose sum is σ = 219142560. Its totient is φ = 70797888.

The previous prime is 128322991. The next prime is 128323007. The reversal of 128322999 is 999223821.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (128322991) and next prime (128323007).

It is not a de Polignac number, because 128322999 - 2³ = 128322991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128322991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33292 + ... + 36945.

It is an arithmetic number, because the mean of its divisors is an integer number (9130940).

Almost surely, 2^128322999 is an apocalyptic number.

128322999 is a deficient number, since it is larger than the sum of its proper divisors (90819561).

128322999 is a wasteful number, since it uses less digits than its factorization.

128322999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70279 (or 70276 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 128322999 is about 11327.9741789960. The cubic root of 128322999 is about 504.3919735124.

The spelling of 128322999 in words is "one hundred twenty-eight million, three hundred twenty-two thousand, nine hundred ninety-nine".