90881217918 has 32 divisors (see below), whose sum is σ = 201999309600. Its totient is φ = 30287582208.

The previous prime is 90881217913. The next prime is 90881217961. The reversal of 90881217918 is 81971218809.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90881217913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101088 + ... + 438156.

It is an arithmetic number, because the mean of its divisors is an integer number (6312478425).

Almost surely, 2^90881217918 is an apocalyptic number.

90881217918 is an abundant number, since it is smaller than the sum of its proper divisors (111118091682).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90881217918 is a wasteful number, since it uses less digits than its factorization.

90881217918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342073 (or 342067 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 54.

The spelling of 90881217918 in words is "ninety billion, eight hundred eighty-one million, two hundred seventeen thousand, nine hundred eighteen".