90720222 has 16 divisors (see below), whose sum is σ = 181766160. Its totient is φ = 30185792.

The previous prime is 90720221. The next prime is 90720241. The reversal of 90720222 is 22202709.

It is a junction number, because it is equal to n+sod(n) for n = 90720192 and 90720201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90720221) 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, 9873 + ... + 16700.

It is an arithmetic number, because the mean of its divisors is an integer number (11360385).

Almost surely, 2^90720222 is an apocalyptic number.

90720222 is an abundant number, since it is smaller than the sum of its proper divisors (91045938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90720222 is a wasteful number, since it uses less digits than its factorization.

90720222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27147.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 90720222 is about 9524.7163737300. The cubic root of 90720222 is about 449.3327097517.

The spelling of 90720222 in words is "ninety million, seven hundred twenty thousand, two hundred twenty-two".