2689343640 has 128 divisors (see below), whose sum is σ = 8998776000. Its totient is φ = 714415104.

The previous prime is 2689343633. The next prime is 2689343641. The reversal of 2689343640 is 463439862.

2689343640 is a `hidden beast` number, since 268 + 9 + 343 + 6 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2689343641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 285892 + ... + 295148.

Almost surely, 2^2689343640 is an apocalyptic number.

2689343640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2689343640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4499388000).

2689343640 is an abundant number, since it is smaller than the sum of its proper divisors (6309432360).

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

2689343640 is a wasteful number, since it uses less digits than its factorization.

2689343640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9546 (or 9536 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 45.

The square root of 2689343640 is about 51858.8819779216. The cubic root of 2689343640 is about 1390.6422924012.

The spelling of 2689343640 in words is "two billion, six hundred eighty-nine million, three hundred forty-three thousand, six hundred forty".