2681807640 has 64 divisors (see below), whose sum is σ = 8048872800. Its totient is φ = 714842112.

The previous prime is 2681807629. The next prime is 2681807671. The reversal of 2681807640 is 467081862.

2681807640 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 2681807592 and 2681807601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 478776 + ... + 484344.

Almost surely, 2^2681807640 is an apocalyptic number.

2681807640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2681807640 is an abundant number, since it is smaller than the sum of its proper divisors (5367065160).

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

2681807640 is a wasteful number, since it uses less digits than its factorization.

2681807640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9596 (or 9592 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 2681807640 is about 51786.1722856594. The cubic root of 2681807640 is about 1389.3421381887.

The spelling of 2681807640 in words is "two billion, six hundred eighty-one million, eight hundred seven thousand, six hundred forty".