2640720826 has 8 divisors (see below), whose sum is σ = 3968957664. Its totient is φ = 1317734940.

The previous prime is 2640720793. The next prime is 2640720829. The reversal of 2640720826 is 6280270462.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (2640720829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1311480 + ... + 1313491.

It is an arithmetic number, because the mean of its divisors is an integer number (496119708).

Almost surely, 2^2640720826 is an apocalyptic number.

2640720826 is a deficient number, since it is larger than the sum of its proper divisors (1328236838).

2640720826 is a wasteful number, since it uses less digits than its factorization.

2640720826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2625476.

The product of its (nonzero) digits is 64512, while the sum is 37.

The square root of 2640720826 is about 51387.9443644129. The cubic root of 2640720826 is about 1382.2104227559.

The spelling of 2640720826 in words is "two billion, six hundred forty million, seven hundred twenty thousand, eight hundred twenty-six".