90808861 has 16 divisors (see below), whose sum is σ = 108158400. Its totient is φ = 75150720.

The previous prime is 90808829. The next prime is 90808871. The reversal of 90808861 is 16880809.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 90808861 - 2⁵ = 90808829 is a prime.

It is a super-2 number, since 2×90808861² = 16492498472234642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90808801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6090 + ... + 14788.

It is an arithmetic number, because the mean of its divisors is an integer number (6759900).

Almost surely, 2^90808861 is an apocalyptic number.

It is an amenable number.

90808861 is a deficient number, since it is larger than the sum of its proper divisors (17349539).

90808861 is a wasteful number, since it uses less digits than its factorization.

90808861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8796.

The product of its (nonzero) digits is 27648, while the sum is 40.

The square root of 90808861 is about 9529.3683421306. The cubic root of 90808861 is about 449.4790036233.

The spelling of 90808861 in words is "ninety million, eight hundred eight thousand, eight hundred sixty-one".