2643648782 has 4 divisors (see below), whose sum is σ = 3965473176. Its totient is φ = 1321824390.

The previous prime is 2643648757. The next prime is 2643648793. The reversal of 2643648782 is 2878463462.

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

It is a self number, because there is not a number n which added to its sum of digits gives 2643648782.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660912194 + ... + 660912197.

It is an arithmetic number, because the mean of its divisors is an integer number (991368294).

Almost surely, 2^2643648782 is an apocalyptic number.

2643648782 is a deficient number, since it is larger than the sum of its proper divisors (1321824394).

2643648782 is a wasteful number, since it uses less digits than its factorization.

2643648782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1321824393.

The product of its digits is 3096576, while the sum is 50.

The square root of 2643648782 is about 51416.4252160727. The cubic root of 2643648782 is about 1382.7210859089.

The spelling of 2643648782 in words is "two billion, six hundred forty-three million, six hundred forty-eight thousand, seven hundred eighty-two".