2638890778 has 8 divisors (see below), whose sum is σ = 3961323072. Its totient is φ = 1318449756.

The previous prime is 2638890733. The next prime is 2638890781. The reversal of 2638890778 is 8770988362.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 494500 + ... + 499807.

It is an arithmetic number, because the mean of its divisors is an integer number (495165384).

Almost surely, 2^2638890778 is an apocalyptic number.

2638890778 is a deficient number, since it is larger than the sum of its proper divisors (1322432294).

2638890778 is a wasteful number, since it uses less digits than its factorization.

2638890778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 995636.

The product of its (nonzero) digits is 8128512, while the sum is 58.

The square root of 2638890778 is about 51370.1350786622. The cubic root of 2638890778 is about 1381.8910533946.

The spelling of 2638890778 in words is "two billion, six hundred thirty-eight million, eight hundred ninety thousand, seven hundred seventy-eight".