90390647 has 2 divisors, whose sum is σ = 90390648. Its totient is φ = 90390646.

The previous prime is 90390611. The next prime is 90390673. The reversal of 90390647 is 74609309.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90390647 - 2⁶ = 90390583 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90390647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90390607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45195323 + 45195324.

It is an arithmetic number, because the mean of its divisors is an integer number (45195324).

Almost surely, 2^90390647 is an apocalyptic number.

90390647 is a deficient number, since it is larger than the sum of its proper divisors (1).

90390647 is an equidigital number, since it uses as much as digits as its factorization.

90390647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 90390647 is about 9507.3995918968. The cubic root of 90390647 is about 448.7879266936.

The spelling of 90390647 in words is "ninety million, three hundred ninety thousand, six hundred forty-seven".