2643640238 has 16 divisors (see below), whose sum is σ = 3980140416. Its totient is φ = 1316936760.

The previous prime is 2643640229. The next prime is 2643640243. The reversal of 2643640238 is 8320463462.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 693245 + ... + 697047.

It is an arithmetic number, because the mean of its divisors is an integer number (248758776).

Almost surely, 2^2643640238 is an apocalyptic number.

2643640238 is a deficient number, since it is larger than the sum of its proper divisors (1336500178).

2643640238 is a wasteful number, since it uses less digits than its factorization.

2643640238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4999.

The product of its (nonzero) digits is 165888, while the sum is 38.

The square root of 2643640238 is about 51416.3421297159. The cubic root of 2643640238 is about 1382.7195963034.

The spelling of 2643640238 in words is "two billion, six hundred forty-three million, six hundred forty thousand, two hundred thirty-eight".