90742072220 has 24 divisors (see below), whose sum is σ = 196705396608. Its totient is φ = 35125963200.

The previous prime is 90742072171. The next prime is 90742072231. The reversal of 90742072220 is 2227024709.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73178471 + ... + 73179710.

It is an arithmetic number, because the mean of its divisors is an integer number (8196058192).

Almost surely, 2^90742072220 is an apocalyptic number.

It is an amenable number.

90742072220 is an abundant number, since it is smaller than the sum of its proper divisors (105963324388).

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

90742072220 is a wasteful number, since it uses less digits than its factorization.

90742072220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146358221 (or 146358219 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 35.

Adding to 90742072220 its reverse (2227024709), we get a palindrome (92969096929).

The spelling of 90742072220 in words is "ninety billion, seven hundred forty-two million, seventy-two thousand, two hundred twenty".