2638874678 has 16 divisors (see below), whose sum is σ = 4319254800. Its totient is φ = 1199184000.

The previous prime is 2638874671. The next prime is 2638874687. The reversal of 2638874678 is 8764788362.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2638874671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89378 + ... + 115178.

It is an arithmetic number, because the mean of its divisors is an integer number (269953425).

Almost surely, 2^2638874678 is an apocalyptic number.

2638874678 is a deficient number, since it is larger than the sum of its proper divisors (1680380122).

2638874678 is a wasteful number, since it uses less digits than its factorization.

2638874678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30463.

The product of its digits is 21676032, while the sum is 59.

The square root of 2638874678 is about 51369.9783725865. The cubic root of 2638874678 is about 1381.8882430609. Note that the first 3 decimals are identical.

The spelling of 2638874678 in words is "two billion, six hundred thirty-eight million, eight hundred seventy-four thousand, six hundred seventy-eight".