128636390 has 16 divisors (see below), whose sum is σ = 232163280. Its totient is φ = 51317280.

The previous prime is 128636371. The next prime is 128636407. The reversal of 128636390 is 93636821.

It is a congruent number.

It is an unprimeable number.

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, 13181 + ... + 20760.

It is an arithmetic number, because the mean of its divisors is an integer number (14510205).

Almost surely, 2^128636390 is an apocalyptic number.

128636390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128636390 is a deficient number, since it is larger than the sum of its proper divisors (103526890).

128636390 is a wasteful number, since it uses less digits than its factorization.

128636390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34327.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 128636390 is about 11341.7983582852. The cubic root of 128636390 is about 504.8022491430.

The spelling of 128636390 in words is "one hundred twenty-eight million, six hundred thirty-six thousand, three hundred ninety".