90867805209 has 32 divisors (see below), whose sum is σ = 136155022080. Its totient is φ = 59888678400.

The previous prime is 90867805073. The next prime is 90867805229. The reversal of 90867805209 is 90250876809.

It is a happy number.

It is not a de Polignac number, because 90867805209 - 2¹¹ = 90867803161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90867805229) 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, 2446044 + ... + 2482914.

It is an arithmetic number, because the mean of its divisors is an integer number (4254844440).

Almost surely, 2^90867805209 is an apocalyptic number.

It is an amenable number.

90867805209 is a deficient number, since it is larger than the sum of its proper divisors (45287216871).

90867805209 is a wasteful number, since it uses less digits than its factorization.

90867805209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37918 (or 37912 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The spelling of 90867805209 in words is "ninety billion, eight hundred sixty-seven million, eight hundred five thousand, two hundred nine".