90072889 has 2 divisors, whose sum is σ = 90072890. Its totient is φ = 90072888.

The previous prime is 90072883. The next prime is 90072929. The reversal of 90072889 is 98827009.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88209664 + 1863225 = 9392^2 + 1365^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90072889 is a prime.

It is a super-2 number, since 2×90072889² = 16226250665612642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (90072883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45036444 + 45036445.

It is an arithmetic number, because the mean of its divisors is an integer number (45036445).

Almost surely, 2^90072889 is an apocalyptic number.

It is an amenable number.

90072889 is a deficient number, since it is larger than the sum of its proper divisors (1).

90072889 is an equidigital number, since it uses as much as digits as its factorization.

90072889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 90072889 is about 9490.6737906220. The cubic root of 90072889 is about 448.2614216814.

The spelling of 90072889 in words is "ninety million, seventy-two thousand, eight hundred eighty-nine".