90671665 has 16 divisors (see below), whose sum is σ = 124564608. Its totient is φ = 62067456.

The previous prime is 90671663. The next prime is 90671677. The reversal of 90671665 is 56617609.

It is a cyclic number.

It is not a de Polignac number, because 90671665 - 2¹ = 90671663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90671663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22009 + ... + 25801.

It is an arithmetic number, because the mean of its divisors is an integer number (7785288).

Almost surely, 2^90671665 is an apocalyptic number.

It is an amenable number.

90671665 is a deficient number, since it is larger than the sum of its proper divisors (33892943).

90671665 is a wasteful number, since it uses less digits than its factorization.

90671665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4488.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 90671665 is about 9522.1670327715. The cubic root of 90671665 is about 449.2525286494.

The spelling of 90671665 in words is "ninety million, six hundred seventy-one thousand, six hundred sixty-five".