90688906 has 24 divisors (see below), whose sum is σ = 172630656. Its totient is φ = 35332920.

The previous prime is 90688903. The next prime is 90688909. The reversal of 90688906 is 60988609.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (90688903) and next prime (90688909).

90688906 is a strobogrammatic number because it is the same when read upside-down.

It is not an unprimeable number, because it can be changed into a prime (90688903) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40986 + ... + 43141.

It is an arithmetic number, because the mean of its divisors is an integer number (7192944).

Almost surely, 2^90688906 is an apocalyptic number.

90688906 is a deficient number, since it is larger than the sum of its proper divisors (81941750).

90688906 is a wasteful number, since it uses less digits than its factorization.

90688906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84154 (or 84147 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 90688906 is about 9523.0722983709. The cubic root of 90688906 is about 449.2810016090.

The spelling of 90688906 in words is "ninety million, six hundred eighty-eight thousand, nine hundred six".