2638740806 has 16 divisors (see below), whose sum is σ = 4332462288. Its totient is φ = 1197914400.

The previous prime is 2638740751. The next prime is 2638740859. The reversal of 2638740806 is 6080478362.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 830300 + ... + 833471.

It is an arithmetic number, because the mean of its divisors is an integer number (270778893).

Almost surely, 2^2638740806 is an apocalyptic number.

2638740806 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2638740806 is a deficient number, since it is larger than the sum of its proper divisors (1693721482).

2638740806 is a wasteful number, since it uses less digits than its factorization.

2638740806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1663847.

The product of its (nonzero) digits is 387072, while the sum is 44.

The square root of 2638740806 is about 51368.6753381864. The cubic root of 2638740806 is about 1381.8648746060.

The spelling of 2638740806 in words is "two billion, six hundred thirty-eight million, seven hundred forty thousand, eight hundred six".