2788861 has 8 divisors (see below), whose sum is σ = 2878848. Its totient is φ = 2700000.

The previous prime is 2788831. The next prime is 2788889. The reversal of 2788861 is 1688872.

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

It is a 5-Lehmer number, since φ(2788861) divides (2788861-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 2788861 - 2⁵ = 2788829 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 (2788831) 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, 10156 + ... + 10426.

It is an arithmetic number, because the mean of its divisors is an integer number (359856).

2^2788861 is an apocalyptic number.

It is an amenable number.

2788861 is a deficient number, since it is larger than the sum of its proper divisors (89987).

2788861 is a wasteful number, since it uses less digits than its factorization.

2788861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563.

The product of its digits is 43008, while the sum is 40.

The square root of 2788861 is about 1669.9883233125. The cubic root of 2788861 is about 140.7588218135.

It can be divided in two parts, 27 and 88861, that added together give a palindrome (88888).

The spelling of 2788861 in words is "two million, seven hundred eighty-eight thousand, eight hundred sixty-one".