128420090 has 16 divisors (see below), whose sum is σ = 233942688. Its totient is φ = 50748816.

The previous prime is 128420087. The next prime is 128420099. The reversal of 128420090 is 90024821.

It is not an unprimeable number, because it can be changed into a prime (128420099) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76532 + ... + 78191.

It is an arithmetic number, because the mean of its divisors is an integer number (14621418).

Almost surely, 2^128420090 is an apocalyptic number.

128420090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128420090 is a deficient number, since it is larger than the sum of its proper divisors (105522598).

128420090 is a wasteful number, since it uses less digits than its factorization.

128420090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154813.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 128420090 is about 11332.2588216119. The cubic root of 128420090 is about 504.5191514819.

The spelling of 128420090 in words is "one hundred twenty-eight million, four hundred twenty thousand, ninety".