2788991 has 8 divisors (see below), whose sum is σ = 2953200. Its totient is φ = 2626560.

The previous prime is 2788987. The next prime is 2788997. The reversal of 2788991 is 1998872.

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

It is not a de Polignac number, because 2788991 - 2² = 2788987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2788997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4031 + ... + 4671.

It is an arithmetic number, because the mean of its divisors is an integer number (369150).

2^2788991 is an apocalyptic number.

2788991 is a deficient number, since it is larger than the sum of its proper divisors (164209).

2788991 is a wasteful number, since it uses less digits than its factorization.

2788991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889.

The product of its digits is 72576, while the sum is 44.

The square root of 2788991 is about 1670.0272452867. The cubic root of 2788991 is about 140.7610088906.

The spelling of 2788991 in words is "two million, seven hundred eighty-eight thousand, nine hundred ninety-one".