90811806 has 8 divisors (see below), whose sum is σ = 181623624. Its totient is φ = 30270600.

The previous prime is 90811793. The next prime is 90811813. The reversal of 90811806 is 60811809.

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

90811806 is an admirable number.

90811806 is a strobogrammatic number because it is the same when read upside-down.

It is a Curzon number.

It is a congruent 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, 7567645 + ... + 7567656.

It is an arithmetic number, because the mean of its divisors is an integer number (22702953).

Almost surely, 2^90811806 is an apocalyptic number.

90811806 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90811806 is a wasteful number, since it uses less digits than its factorization.

90811806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15135306.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 90811806 is about 9529.5228631868. The cubic root of 90811806 is about 449.4838625521.

The spelling of 90811806 in words is "ninety million, eight hundred eleven thousand, eight hundred six".