128591290 has 16 divisors (see below), whose sum is σ = 231742368. Its totient is φ = 51374736.

The previous prime is 128591279. The next prime is 128591311. The reversal of 128591290 is 92195821.

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, 1549 + ... + 16111.

It is an arithmetic number, because the mean of its divisors is an integer number (14483898).

Almost surely, 2^128591290 is an apocalyptic number.

128591290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128591290 is a deficient number, since it is larger than the sum of its proper divisors (103151078).

128591290 is a wasteful number, since it uses less digits than its factorization.

128591290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15453.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 128591290 is about 11339.8099631343. The cubic root of 128591290 is about 504.7432475841.

It can be divided in two parts, 128591 and 290, that added together give a square (128881 = 359²).

The spelling of 128591290 in words is "one hundred twenty-eight million, five hundred ninety-one thousand, two hundred ninety".