90849796569 has 81 divisors (see below), whose sum is σ = 158076914229. Its totient is φ = 50131010160.

The previous prime is 90849796549. The next prime is 90849796619. The reversal of 90849796569 is 96569794809.

The square root of 90849796569 is 301413.

It is a perfect power (a square), and thus also a powerful number.

It is a de Polignac number, because none of the positive numbers 2^k-90849796569 is a prime.

It is a super-2 number, since 2×90849796569² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 90849796497 and 90849796506.

It is not an unprimeable number, because it can be changed into a prime (90849796549) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 196219632 + ... + 196220094.

Almost surely, 2^90849796569 is an apocalyptic number.

90849796569 is the 301413-rd square number.

90849796569 is the 150707-th centered octagonal number.

It is an amenable number.

90849796569 is a deficient number, since it is larger than the sum of its proper divisors (67227117660).

90849796569 is an equidigital number, since it uses as much as digits as its factorization.

90849796569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008 (or 504 counting only the distinct ones).

The product of its (nonzero) digits is 264539520, while the sum is 72.

The spelling of 90849796569 in words is "ninety billion, eight hundred forty-nine million, seven hundred ninety-six thousand, five hundred sixty-nine".