90638693 has 2 divisors, whose sum is σ = 90638694. Its totient is φ = 90638692.

The previous prime is 90638689. The next prime is 90638707. The reversal of 90638693 is 39683609.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76335169 + 14303524 = 8737^2 + 3782^2 .

It is a cyclic number.

It is not a de Polignac number, because 90638693 - 2² = 90638689 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90638663) 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, 45319346 + 45319347.

It is an arithmetic number, because the mean of its divisors is an integer number (45319347).

Almost surely, 2^90638693 is an apocalyptic number.

It is an amenable number.

90638693 is a deficient number, since it is larger than the sum of its proper divisors (1).

90638693 is an equidigital number, since it uses as much as digits as its factorization.

90638693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 44.

The square root of 90638693 is about 9520.4355467594. The cubic root of 90638693 is about 449.1980663936.

The spelling of 90638693 in words is "ninety million, six hundred thirty-eight thousand, six hundred ninety-three".