2691490680 has 320 divisors, whose sum is σ = 9456353280. Its totient is φ = 685843200.

The previous prime is 2691490663. The next prime is 2691490687. The reversal of 2691490680 is 860941962.

It is a happy number.

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 (2691490687) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 12755775 + ... + 12755985.

It is an arithmetic number, because the mean of its divisors is an integer number (29551104).

Almost surely, 2^2691490680 is an apocalyptic number.

2691490680 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 2691490680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4728176640).

2691490680 is an abundant number, since it is smaller than the sum of its proper divisors (6764862600).

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

2691490680 is a wasteful number, since it uses less digits than its factorization.

2691490680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392 (or 379 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 2691490680 is about 51879.5786413113. The cubic root of 2691490680 is about 1391.0122674852.

The spelling of 2691490680 in words is "two billion, six hundred ninety-one million, four hundred ninety thousand, six hundred eighty".