90229720 has 32 divisors (see below), whose sum is σ = 232020000. Its totient is φ = 30935808.

The previous prime is 90229697. The next prime is 90229729. The reversal of 90229720 is 2792209.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90229729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160845 + ... + 161404.

It is an arithmetic number, because the mean of its divisors is an integer number (7250625).

Almost surely, 2^90229720 is an apocalyptic number.

It is an amenable number.

90229720 is an abundant number, since it is smaller than the sum of its proper divisors (141790280).

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

90229720 is a wasteful number, since it uses less digits than its factorization.

90229720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322267 (or 322263 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 90229720 is about 9498.9325716103. The cubic root of 90229720 is about 448.5214352674.

The spelling of 90229720 in words is "ninety million, two hundred twenty-nine thousand, seven hundred twenty".