90845281791 has 36 divisors (see below), whose sum is σ = 147917001960. Its totient is φ = 53281634400.

The previous prime is 90845281763. The next prime is 90845281823. The reversal of 90845281791 is 19718254809.

It is a happy number.

90845281791 is a `hidden beast` number, since 90 + 8 + 452 + 8 + 17 + 91 = 666.

It is not a de Polignac number, because 90845281791 - 2⁵ = 90845281759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90845281721) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 382296 + ... + 572573.

It is an arithmetic number, because the mean of its divisors is an integer number (4108805610).

Almost surely, 2^90845281791 is an apocalyptic number.

90845281791 is a deficient number, since it is larger than the sum of its proper divisors (57071720169).

90845281791 is a wasteful number, since it uses less digits than its factorization.

90845281791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 954948 (or 954914 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 54.

The spelling of 90845281791 in words is "ninety billion, eight hundred forty-five million, two hundred eighty-one thousand, seven hundred ninety-one".