128320090 has 16 divisors (see below), whose sum is σ = 231971688. Its totient is φ = 51106816.

The previous prime is 128320079. The next prime is 128320109. The reversal of 128320090 is 90023821.

It can be written as a sum of positive squares in 4 ways, for example, as 113273449 + 15046641 = 10643^2 + 3879^2 .

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, 25207 + ... + 29866.

Almost surely, 2^128320090 is an apocalyptic number.

128320090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128320090 is a deficient number, since it is larger than the sum of its proper divisors (103651598).

128320090 is a wasteful number, since it uses less digits than its factorization.

128320090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55313.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 128320090 is about 11327.8457793174. The cubic root of 128320090 is about 504.3881620696.

The spelling of 128320090 in words is "one hundred twenty-eight million, three hundred twenty thousand, ninety".