2685997640 has 32 divisors (see below), whose sum is σ = 6046522560. Its totient is φ = 1073860800.

The previous prime is 2685997627. The next prime is 2685997649. The reversal of 2685997640 is 467995862.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2685997649) 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, 69485 + ... + 100995.

It is an arithmetic number, because the mean of its divisors is an integer number (188953830).

Almost surely, 2^2685997640 is an apocalyptic number.

2685997640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2685997640 is an abundant number, since it is smaller than the sum of its proper divisors (3360524920).

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

2685997640 is a wasteful number, since it uses less digits than its factorization.

2685997640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33653 (or 33649 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 56.

The square root of 2685997640 is about 51826.6113111787. The cubic root of 2685997640 is about 1390.0653213614.

The spelling of 2685997640 in words is "two billion, six hundred eighty-five million, nine hundred ninety-seven thousand, six hundred forty".