2640278216 has 16 divisors (see below), whose sum is σ = 4952267100. Its totient is φ = 1319673664.

The previous prime is 2640278203. The next prime is 2640278239. The reversal of 2640278216 is 6128720462.

It can be written as a sum of positive squares in 2 ways, for example, as 2606102500 + 34175716 = 51050^2 + 5846^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2640278216.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33455 + ... + 79998.

Almost surely, 2^2640278216 is an apocalyptic number.

It is an amenable number.

2640278216 is a deficient number, since it is larger than the sum of its proper divisors (2311988884).

2640278216 is a wasteful number, since it uses less digits than its factorization.

2640278216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116368 (or 116364 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 2640278216 is about 51383.6376291130. The cubic root of 2640278216 is about 1382.1331945572.

Adding to 2640278216 its reverse (6128720462), we get a palindrome (8768998678).

The spelling of 2640278216 in words is "two billion, six hundred forty million, two hundred seventy-eight thousand, two hundred sixteen".