90908109 has 32 divisors (see below), whose sum is σ = 137795840. Its totient is φ = 59222016.

The previous prime is 90908107. The next prime is 90908113. The reversal of 90908109 is 90180909.

It is not a de Polignac number, because 90908109 - 2¹ = 90908107 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct 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 (90908107) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 269589 + ... + 269925.

It is an arithmetic number, because the mean of its divisors is an integer number (4306120).

Almost surely, 2^90908109 is an apocalyptic number.

It is an amenable number.

90908109 is a deficient number, since it is larger than the sum of its proper divisors (46887731).

90908109 is a wasteful number, since it uses less digits than its factorization.

90908109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546 (or 540 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 90908109 is about 9534.5744005697. The cubic root of 90908109 is about 449.6426941474.

The spelling of 90908109 in words is "ninety million, nine hundred eight thousand, one hundred nine".