90640835 has 4 divisors (see below), whose sum is σ = 108769008. Its totient is φ = 72512664.

The previous prime is 90640819. The next prime is 90640841. The reversal of 90640835 is 53804609.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90640835 - 2⁴ = 90640819 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90640795 and 90640804.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 9064079 + ... + 9064088.

It is an arithmetic number, because the mean of its divisors is an integer number (27192252).

Almost surely, 2^90640835 is an apocalyptic number.

90640835 is a deficient number, since it is larger than the sum of its proper divisors (18128173).

90640835 is a wasteful number, since it uses less digits than its factorization.

90640835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18128172.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 90640835 is about 9520.5480409481. The cubic root of 90640835 is about 449.2016048922.

The spelling of 90640835 in words is "ninety million, six hundred forty thousand, eight hundred thirty-five".