2789864 has 48 divisors (see below), whose sum is σ = 6648480. Its totient is φ = 1085280.

The previous prime is 2789861. The next prime is 2789881. The reversal of 2789864 is 4689872.

It is a super-2 number, since 2×2789864² = 15566682276992, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (2789861) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3989 + ... + 4635.

It is an arithmetic number, because the mean of its divisors is an integer number (138510).

2^2789864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2789864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3324240).

2789864 is an abundant number, since it is smaller than the sum of its proper divisors (3858616).

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

2789864 is a wasteful number, since it uses less digits than its factorization.

2789864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678 (or 667 counting only the distinct ones).

The product of its digits is 193536, while the sum is 44.

The square root of 2789864 is about 1670.2885978178. The cubic root of 2789864 is about 140.7756941946.

The spelling of 2789864 in words is "two million, seven hundred eighty-nine thousand, eight hundred sixty-four".