84128090 has 8 divisors (see below), whose sum is σ = 151430580. Its totient is φ = 33651232.

The previous prime is 84128071. The next prime is 84128111. The reversal of 84128090 is 9082148.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 76615009 + 7513081 = 8753^2 + 2741^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4206395 + ... + 4206414.

Almost surely, 2^84128090 is an apocalyptic number.

84128090 is a deficient number, since it is larger than the sum of its proper divisors (67302490).

84128090 is a wasteful number, since it uses less digits than its factorization.

84128090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8412816.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 84128090 is about 9172.1366104087. The cubic root of 84128090 is about 438.1744091115.

The spelling of 84128090 in words is "eighty-four million, one hundred twenty-eight thousand, ninety".