90991347727 has 8 divisors (see below), whose sum is σ = 104147439392. Its totient is φ = 77874588000.

The previous prime is 90991347721. The next prime is 90991347737. The reversal of 90991347727 is 72774319909.

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 90991347727 - 2⁷ = 90991347599 is a prime.

It is a super-2 number, since 2×90991347727² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90991347721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9828024 + ... + 9837277.

It is an arithmetic number, because the mean of its divisors is an integer number (13018429924).

Almost surely, 2^90991347727 is an apocalyptic number.

90991347727 is a deficient number, since it is larger than the sum of its proper divisors (13156091665).

90991347727 is a wasteful number, since it uses less digits than its factorization.

90991347727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19665969.

The product of its (nonzero) digits is 6001128, while the sum is 58.

The spelling of 90991347727 in words is "ninety billion, nine hundred ninety-one million, three hundred forty-seven thousand, seven hundred twenty-seven".