90444287 has 2 divisors, whose sum is σ = 90444288. Its totient is φ = 90444286.

The previous prime is 90444283. The next prime is 90444307. The reversal of 90444287 is 78244409.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90444287 - 2² = 90444283 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90444287.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90444281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45222143 + 45222144.

It is an arithmetic number, because the mean of its divisors is an integer number (45222144).

Almost surely, 2^90444287 is an apocalyptic number.

90444287 is a deficient number, since it is larger than the sum of its proper divisors (1).

90444287 is an equidigital number, since it uses as much as digits as its factorization.

90444287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 90444287 is about 9510.2201341504. The cubic root of 90444287 is about 448.8766830157.

It can be divided in two parts, 9044 and 4287, that added together give a palindrome (13331).

The spelling of 90444287 in words is "ninety million, four hundred forty-four thousand, two hundred eighty-seven".