90869909 has 8 divisors (see below), whose sum is σ = 98027160. Its totient is φ = 83736576.

The previous prime is 90869881. The next prime is 90869953. The reversal of 90869909 is 90996809.

It can be written as a sum of positive squares in 4 ways, for example, as 3073009 + 87796900 = 1753^2 + 9370^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90869909 - 2²⁴ = 74092693 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 (90869509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2357 + ... + 13685.

It is an arithmetic number, because the mean of its divisors is an integer number (12253395).

Almost surely, 2^90869909 is an apocalyptic number.

It is an amenable number.

90869909 is a deficient number, since it is larger than the sum of its proper divisors (7157251).

90869909 is a wasteful number, since it uses less digits than its factorization.

90869909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11959.

The product of its (nonzero) digits is 314928, while the sum is 50.

The square root of 90869909 is about 9532.5709543648. The cubic root of 90869909 is about 449.5797046901.

The spelling of 90869909 in words is "ninety million, eight hundred sixty-nine thousand, nine hundred nine".