2091689772 has 24 divisors (see below), whose sum is σ = 5012518896. Its totient is φ = 678385728.

The previous prime is 2091689729. The next prime is 2091689779. The reversal of 2091689772 is 2779861902.

It is a super-2 number, since 2×2091689772² = 8750332204578823968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2091689779) 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, 2355063 + ... + 2355950.

It is an arithmetic number, because the mean of its divisors is an integer number (208854954).

Almost surely, 2^2091689772 is an apocalyptic number.

It is an amenable number.

2091689772 is an abundant number, since it is smaller than the sum of its proper divisors (2920829124).

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

2091689772 is a wasteful number, since it uses less digits than its factorization.

2091689772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4711057 (or 4711055 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 51.

The square root of 2091689772 is about 45734.9950475563. The cubic root of 2091689772 is about 1278.8877406478.

The spelling of 2091689772 in words is "two billion, ninety-one million, six hundred eighty-nine thousand, seven hundred seventy-two".