90664906 has 4 divisors (see below), whose sum is σ = 135997362. Its totient is φ = 45332452.

The previous prime is 90664901. The next prime is 90664907. The reversal of 90664906 is 60946609.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60946609 = 43 ⋅1417363.

It can be written as a sum of positive squares in only one way, i.e., 79834225 + 10830681 = 8935^2 + 3291^2 .

It is not an unprimeable number, because it can be changed into a prime (90664901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22666225 + ... + 22666228.

Almost surely, 2^90664906 is an apocalyptic number.

90664906 is a deficient number, since it is larger than the sum of its proper divisors (45332456).

90664906 is a wasteful number, since it uses less digits than its factorization.

90664906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45332455.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 90664906 is about 9521.8121174491. The cubic root of 90664906 is about 449.2413653924.

The spelling of 90664906 in words is "ninety million, six hundred sixty-four thousand, nine hundred six".