90723144020 has 54 divisors (see below), whose sum is σ = 194794370862. Its totient is φ = 35492360576.

The previous prime is 90723144019. The next prime is 90723144047. The reversal of 90723144020 is 2044132709.

It can be written as a sum of positive squares in 3 ways, for example, as 35983054864 + 54740089156 = 189692^2 + 233966^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 63309224 + ... + 63310656.

Almost surely, 2^90723144020 is an apocalyptic number.

It is an amenable number.

90723144020 is an abundant number, since it is smaller than the sum of its proper divisors (104071226842).

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

90723144020 is an equidigital number, since it uses as much as digits as its factorization.

90723144020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2969 (or 1487 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

Adding to 90723144020 its reverse (2044132709), we get a palindrome (92767276729).

The spelling of 90723144020 in words is "ninety billion, seven hundred twenty-three million, one hundred forty-four thousand, twenty".