2640534238 has 4 divisors (see below), whose sum is σ = 3960801360. Its totient is φ = 1320267118.

The previous prime is 2640534223. The next prime is 2640534241. The reversal of 2640534238 is 8324350462.

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

It is a junction number, because it is equal to n+sod(n) for n = 2640534197 and 2640534206.

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 as a sum of consecutive naturals, namely, 660133558 + ... + 660133561.

It is an arithmetic number, because the mean of its divisors is an integer number (990200340).

Almost surely, 2^2640534238 is an apocalyptic number.

2640534238 is a deficient number, since it is larger than the sum of its proper divisors (1320267122).

2640534238 is a wasteful number, since it uses less digits than its factorization.

2640534238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1320267121.

The product of its (nonzero) digits is 138240, while the sum is 37.

The square root of 2640534238 is about 51386.1288481629. The cubic root of 2640534238 is about 1382.1778672569.

The spelling of 2640534238 in words is "two billion, six hundred forty million, five hundred thirty-four thousand, two hundred thirty-eight".