90378289 has 2 divisors, whose sum is σ = 90378290. Its totient is φ = 90378288.

The previous prime is 90378287. The next prime is 90378313. The reversal of 90378289 is 98287309.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63680400 + 26697889 = 7980^2 + 5167^2 .

It is a cyclic number.

It is not a de Polignac number, because 90378289 - 2¹ = 90378287 is a prime.

Together with 90378287, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (90378283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45189144 + 45189145.

It is an arithmetic number, because the mean of its divisors is an integer number (45189145).

Almost surely, 2^90378289 is an apocalyptic number.

It is an amenable number.

90378289 is a deficient number, since it is larger than the sum of its proper divisors (1).

90378289 is an equidigital number, since it uses as much as digits as its factorization.

90378289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 90378289 is about 9506.7496548505. The cubic root of 90378289 is about 448.7674733460.

The spelling of 90378289 in words is "ninety million, three hundred seventy-eight thousand, two hundred eighty-nine".