90509767 has 2 divisors, whose sum is σ = 90509768. Its totient is φ = 90509766.

The previous prime is 90509759. The next prime is 90509779. The reversal of 90509767 is 76790509.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90509767 - 2³ = 90509759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90504767) 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, 45254883 + 45254884.

It is an arithmetic number, because the mean of its divisors is an integer number (45254884).

Almost surely, 2^90509767 is an apocalyptic number.

90509767 is a deficient number, since it is larger than the sum of its proper divisors (1).

90509767 is an equidigital number, since it uses as much as digits as its factorization.

90509767 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 119070, while the sum is 43.

The square root of 90509767 is about 9513.6621234938. The cubic root of 90509767 is about 448.9849830379.

The spelling of 90509767 in words is "ninety million, five hundred nine thousand, seven hundred sixty-seven".