90907085 has 4 divisors (see below), whose sum is σ = 109088508. Its totient is φ = 72725664.

The previous prime is 90907081. The next prime is 90907121. The reversal of 90907085 is 58070909.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58070909 = 13 ⋅4466993.

It can be written as a sum of positive squares in 2 ways, for example, as 36457444 + 54449641 = 6038^2 + 7379^2 .

It is a cyclic number.

It is not a de Polignac number, because 90907085 - 2² = 90907081 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90907081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9090704 + ... + 9090713.

It is an arithmetic number, because the mean of its divisors is an integer number (27272127).

Almost surely, 2^90907085 is an apocalyptic number.

It is an amenable number.

90907085 is a deficient number, since it is larger than the sum of its proper divisors (18181423).

90907085 is a wasteful number, since it uses less digits than its factorization.

90907085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18181422.

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 90907085 is about 9534.5207011155. The cubic root of 90907085 is about 449.6410058644.

The spelling of 90907085 in words is "ninety million, nine hundred seven thousand, eighty-five".