90666873 has 18 divisors (see below), whose sum is σ = 143953082. Its totient is φ = 54948960.

The previous prime is 90666869. The next prime is 90666889. The reversal of 90666873 is 37866609.

It can be written as a sum of positive squares in only one way, i.e., 87834384 + 2832489 = 9372^2 + 1683^2 .

It is not a de Polignac number, because 90666873 - 2² = 90666869 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (90666853) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 40540 + ... + 42717.

Almost surely, 2^90666873 is an apocalyptic number.

It is an amenable number.

90666873 is a deficient number, since it is larger than the sum of its proper divisors (53286209).

90666873 is a wasteful number, since it uses less digits than its factorization.

90666873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83285 (or 83271 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 90666873 is about 9521.9154060515. The cubic root of 90666873 is about 449.2446141738.

The spelling of 90666873 in words is "ninety million, six hundred sixty-six thousand, eight hundred seventy-three".