2640256536 has 64 divisors (see below), whose sum is σ = 6994512000. Its totient is φ = 827652608.

The previous prime is 2640256501. The next prime is 2640256543. The reversal of 2640256536 is 6356520462.

It is a junction number, because it is equal to n+sod(n) for n = 2640256494 and 2640256503.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 854851 + ... + 857933.

It is an arithmetic number, because the mean of its divisors is an integer number (109289250).

Almost surely, 2^2640256536 is an apocalyptic number.

It is an amenable number.

2640256536 is an abundant number, since it is smaller than the sum of its proper divisors (4354255464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2640256536 is a wasteful number, since it uses less digits than its factorization.

2640256536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5208 (or 5204 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 39.

The square root of 2640256536 is about 51383.4266665819. The cubic root of 2640256536 is about 1382.1294115304.

Adding to 2640256536 its reverse (6356520462), we get a palindrome (8996776998).

The spelling of 2640256536 in words is "two billion, six hundred forty million, two hundred fifty-six thousand, five hundred thirty-six".