90772221 has 8 divisors (see below), whose sum is σ = 121212160. Its totient is φ = 60423552.

The previous prime is 90772207. The next prime is 90772229. The reversal of 90772221 is 12227709.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 90772221 - 2⁵ = 90772189 is a prime.

It is a super-2 number, since 2×90772221² = 16479192210545682, 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 (90772229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20461 + ... + 24498.

It is an arithmetic number, because the mean of its divisors is an integer number (15151520).

Almost surely, 2^90772221 is an apocalyptic number.

It is an amenable number.

90772221 is a deficient number, since it is larger than the sum of its proper divisors (30439939).

90772221 is a wasteful number, since it uses less digits than its factorization.

90772221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45635.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 90772221 is about 9527.4456702728. The cubic root of 90772221 is about 449.4185428342.

The spelling of 90772221 in words is "ninety million, seven hundred seventy-two thousand, two hundred twenty-one".