90811805 has 16 divisors (see below), whose sum is σ = 124857984. Its totient is φ = 62112960.

The previous prime is 90811793. The next prime is 90811813. The reversal of 90811805 is 50811809.

It is a happy number.

It is not a de Polignac number, because 90811805 - 2¹⁸ = 90549661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11654 + ... + 17816.

It is an arithmetic number, because the mean of its divisors is an integer number (7803624).

Almost surely, 2^90811805 is an apocalyptic number.

It is an amenable number.

90811805 is a deficient number, since it is larger than the sum of its proper divisors (34046179).

90811805 is a wasteful number, since it uses less digits than its factorization.

90811805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6596.

The product of its (nonzero) digits is 2880, while the sum is 32.

The square root of 90811805 is about 9529.5228107183. The cubic root of 90811805 is about 449.4838609022.

The spelling of 90811805 in words is "ninety million, eight hundred eleven thousand, eight hundred five".