90809615 has 12 divisors (see below), whose sum is σ = 117999864. Its totient is φ = 67058784.

The previous prime is 90809611. The next prime is 90809623. The reversal of 90809615 is 51690809.

It is not a de Polignac number, because 90809615 - 2² = 90809611 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90809611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52889 + ... + 54578.

It is an arithmetic number, because the mean of its divisors is an integer number (9833322).

Almost surely, 2^90809615 is an apocalyptic number.

90809615 is a deficient number, since it is larger than the sum of its proper divisors (27190249).

90809615 is a wasteful number, since it uses less digits than its factorization.

90809615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107498 (or 107485 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 90809615 is about 9529.4079039571. The cubic root of 90809615 is about 449.4802476511.

The spelling of 90809615 in words is "ninety million, eight hundred nine thousand, six hundred fifteen".