2685540640 has 48 divisors (see below), whose sum is σ = 6347859840. Its totient is φ = 1073662720.

The previous prime is 2685540589. The next prime is 2685540647. The reversal of 2685540640 is 460455862.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 2685540593 and 2685540602.

It is not an unprimeable number, because it can be changed into a prime (2685540647) 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, 467385 + ... + 473095.

It is an arithmetic number, because the mean of its divisors is an integer number (132247080).

Almost surely, 2^2685540640 is an apocalyptic number.

2685540640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2685540640 is an abundant number, since it is smaller than the sum of its proper divisors (3662319200).

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

2685540640 is a wasteful number, since it uses less digits than its factorization.

2685540640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8665 (or 8657 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 40.

The square root of 2685540640 is about 51822.2021917247. The cubic root of 2685540640 is about 1389.9864808995.

The spelling of 2685540640 in words is "two billion, six hundred eighty-five million, five hundred forty thousand, six hundred forty".