2678332991 has 4 divisors (see below), whose sum is σ = 2678960592. Its totient is φ = 2677705392.

The previous prime is 2678332939. The next prime is 2678332997. The reversal of 2678332991 is 1992338762.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2678332991 - 2¹⁸ = 2678070847 is a prime.

It is a super-2 number, since 2×2678332991² = 14346935221358012162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2678332997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 307355 + ... + 315948.

It is an arithmetic number, because the mean of its divisors is an integer number (669740148).

Almost surely, 2^2678332991 is an apocalyptic number.

2678332991 is a deficient number, since it is larger than the sum of its proper divisors (627601).

2678332991 is an equidigital number, since it uses as much as digits as its factorization.

2678332991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627600.

The product of its digits is 979776, while the sum is 50.

The square root of 2678332991 is about 51752.6133736259. The cubic root of 2678332991 is about 1388.7418512048.

The spelling of 2678332991 in words is "two billion, six hundred seventy-eight million, three hundred thirty-two thousand, nine hundred ninety-one".