2638646805 has 16 divisors (see below), whose sum is σ = 4291046784. Its totient is φ = 1384207680.

The previous prime is 2638646767. The next prime is 2638646807. The reversal of 2638646805 is 5086468362.

It is not a de Polignac number, because 2638646805 - 2⁷ = 2638646677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2638646807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1440969 + ... + 1442798.

It is an arithmetic number, because the mean of its divisors is an integer number (268190424).

Almost surely, 2^2638646805 is an apocalyptic number.

It is an amenable number.

2638646805 is a deficient number, since it is larger than the sum of its proper divisors (1652399979).

2638646805 is a wasteful number, since it uses less digits than its factorization.

2638646805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2883836.

The product of its (nonzero) digits is 1658880, while the sum is 48.

The square root of 2638646805 is about 51367.7603658170. The cubic root of 2638646805 is about 1381.8484654887.

The spelling of 2638646805 in words is "two billion, six hundred thirty-eight million, six hundred forty-six thousand, eight hundred five".