90684287 has 2 divisors, whose sum is σ = 90684288. Its totient is φ = 90684286.

The previous prime is 90684277. The next prime is 90684311. The reversal of 90684287 is 78248609.

It is a weak prime.

It is an emirp because it is prime and its reverse (78248609) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90684287 - 2⁴ = 90684271 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90684277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45342143 + 45342144.

It is an arithmetic number, because the mean of its divisors is an integer number (45342144).

Almost surely, 2^90684287 is an apocalyptic number.

90684287 is a deficient number, since it is larger than the sum of its proper divisors (1).

90684287 is an equidigital number, since it uses as much as digits as its factorization.

90684287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 90684287 is about 9522.8297790100. The cubic root of 90684287 is about 449.2733738323.

The spelling of 90684287 in words is "ninety million, six hundred eighty-four thousand, two hundred eighty-seven".