2791816638 has 32 divisors (see below), whose sum is σ = 6141090816. Its totient is φ = 840742368.

The previous prime is 2791816633. The next prime is 2791816663. The reversal of 2791816638 is 8366181972.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2791816633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 377106 + ... + 384437.

It is an arithmetic number, because the mean of its divisors is an integer number (191909088).

Almost surely, 2^2791816638 is an apocalyptic number.

2791816638 is an abundant number, since it is smaller than the sum of its proper divisors (3349274178).

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

2791816638 is a wasteful number, since it uses less digits than its factorization.

2791816638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 761608.

The product of its digits is 870912, while the sum is 51.

The square root of 2791816638 is about 52837.6441374897. The cubic root of 2791816638 is about 1408.0852970962.

The spelling of 2791816638 in words is "two billion, seven hundred ninety-one million, eight hundred sixteen thousand, six hundred thirty-eight".