90222745 has 4 divisors (see below), whose sum is σ = 108267300. Its totient is φ = 72178192.

The previous prime is 90222733. The next prime is 90222749. The reversal of 90222745 is 54722209.

90222745 = 6716² + 6717².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54722209 = 227 ⋅241067.

It can be written as a sum of positive squares in 2 ways, for example, as 45118089 + 45104656 = 6717^2 + 6716^2 .

It is a cyclic number.

It is not a de Polignac number, because 90222745 - 2¹⁹ = 89698457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90222749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9022270 + ... + 9022279.

It is an arithmetic number, because the mean of its divisors is an integer number (27066825).

Almost surely, 2^90222745 is an apocalyptic number.

90222745 is the 6717-th centered square number.

It is an amenable number.

90222745 is a deficient number, since it is larger than the sum of its proper divisors (18044555).

90222745 is a wasteful number, since it uses less digits than its factorization.

90222745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18044554.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 90222745 is about 9498.5654179987. The cubic root of 90222745 is about 448.5098776652.

The spelling of 90222745 in words is "ninety million, two hundred twenty-two thousand, seven hundred forty-five".