90221673 has 4 divisors (see below), whose sum is σ = 120295568. Its totient is φ = 60147780.

The previous prime is 90221657. The next prime is 90221683. The reversal of 90221673 is 37612209.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37612209 = 3 ⋅12537403.

It is not a de Polignac number, because 90221673 - 2⁴ = 90221657 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90221673.

It is not an unprimeable number, because it can be changed into a prime (90221653) 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, 15036943 + ... + 15036948.

It is an arithmetic number, because the mean of its divisors is an integer number (30073892).

Almost surely, 2^90221673 is an apocalyptic number.

It is an amenable number.

90221673 is a deficient number, since it is larger than the sum of its proper divisors (30073895).

90221673 is a wasteful number, since it uses less digits than its factorization.

90221673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30073894.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 90221673 is about 9498.5089882571. The cubic root of 90221673 is about 448.5081013042.

The spelling of 90221673 in words is "ninety million, two hundred twenty-one thousand, six hundred seventy-three".