90900900907 has 4 divisors (see below), whose sum is σ = 91170636856. Its totient is φ = 90631164960.

The previous prime is 90900900899. The next prime is 90900900913. The reversal of 90900900907 is 70900900909.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70900900909 = 229 ⋅309610921.

It is a cyclic number.

It is not a de Polignac number, because 90900900907 - 2³ = 90900900899 is a prime.

It is a super-3 number, since 3×90900900907³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90900900947) 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, 134867469 + ... + 134868142.

It is an arithmetic number, because the mean of its divisors is an integer number (22792659214).

Almost surely, 2^90900900907 is an apocalyptic number.

90900900907 is a deficient number, since it is larger than the sum of its proper divisors (269735949).

90900900907 is a wasteful number, since it uses less digits than its factorization.

90900900907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269735948.

The product of its (nonzero) digits is 45927, while the sum is 43.

The spelling of 90900900907 in words is "ninety billion, nine hundred million, nine hundred thousand, nine hundred seven".