2648782691 has 4 divisors (see below), whose sum is σ = 2650565472. Its totient is φ = 2646999912.

The previous prime is 2648782637. The next prime is 2648782709. The reversal of 2648782691 is 1962878462.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2648782691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2648782621) 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, 889160 + ... + 892133.

It is an arithmetic number, because the mean of its divisors is an integer number (662641368).

Almost surely, 2^2648782691 is an apocalyptic number.

2648782691 is a deficient number, since it is larger than the sum of its proper divisors (1782781).

2648782691 is a wasteful number, since it uses less digits than its factorization.

2648782691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1782780.

The product of its digits is 2322432, while the sum is 53.

The square root of 2648782691 is about 51466.3257965828. The cubic root of 2648782691 is about 1383.6155786534.

The spelling of 2648782691 in words is "two billion, six hundred forty-eight million, seven hundred eighty-two thousand, six hundred ninety-one".