90638347 has 2 divisors, whose sum is σ = 90638348. Its totient is φ = 90638346.

The previous prime is 90638329. The next prime is 90638351. The reversal of 90638347 is 74383609.

It is a strong prime.

It is an emirp because it is prime and its reverse (74383609) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90638347 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90630347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45319173 + 45319174.

It is an arithmetic number, because the mean of its divisors is an integer number (45319174).

Almost surely, 2^90638347 is an apocalyptic number.

90638347 is a deficient number, since it is larger than the sum of its proper divisors (1).

90638347 is an equidigital number, since it uses as much as digits as its factorization.

90638347 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 90638347 is about 9520.4173753045. The cubic root of 90638347 is about 449.1974948101.

The spelling of 90638347 in words is "ninety million, six hundred thirty-eight thousand, three hundred forty-seven".