90222805 has 4 divisors (see below), whose sum is σ = 108267372. Its totient is φ = 72178240.

The previous prime is 90222749. The next prime is 90222809. The reversal of 90222805 is 50822209.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50822209 = 467 ⋅108827.

It can be written as a sum of positive squares in 2 ways, for example, as 45185284 + 45037521 = 6722^2 + 6711^2 .

It is not a de Polignac number, because 90222805 - 2¹⁷ = 90091733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90222809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9022276 + ... + 9022285.

It is an arithmetic number, because the mean of its divisors is an integer number (27066843).

Almost surely, 2^90222805 is an apocalyptic number.

It is an amenable number.

90222805 is a deficient number, since it is larger than the sum of its proper divisors (18044567).

90222805 is a wasteful number, since it uses less digits than its factorization.

90222805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18044566.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 90222805 is about 9498.5685763698. The cubic root of 90222805 is about 448.5099770879.

The spelling of 90222805 in words is "ninety million, two hundred twenty-two thousand, eight hundred five".