2691787660 has 24 divisors (see below), whose sum is σ = 5835102336. Its totient is φ = 1041982080.

The previous prime is 2691787649. The next prime is 2691787669. The reversal of 2691787660 is 667871962.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2691787598 and 2691787607.

It is not an unprimeable number, because it can be changed into a prime (2691787669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2170177 + ... + 2171416.

It is an arithmetic number, because the mean of its divisors is an integer number (243129264).

Almost surely, 2^2691787660 is an apocalyptic number.

2691787660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2691787660 is an abundant number, since it is smaller than the sum of its proper divisors (3143314676).

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

2691787660 is a wasteful number, since it uses less digits than its factorization.

2691787660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4341633 (or 4341631 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 52.

The square root of 2691787660 is about 51882.4407675661. The cubic root of 2691787660 is about 1391.0634271930.

The spelling of 2691787660 in words is "two billion, six hundred ninety-one million, seven hundred eighty-seven thousand, six hundred sixty".