2788729 has 4 divisors (see below), whose sum is σ = 2878720. Its totient is φ = 2698740.

The previous prime is 2788699. The next prime is 2788769. The reversal of 2788729 is 9278872.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2788729 - 2⁹ = 2788217 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 (2788769) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44949 + ... + 45010.

It is an arithmetic number, because the mean of its divisors is an integer number (719680).

2^2788729 is an apocalyptic number.

It is an amenable number.

2788729 is a deficient number, since it is larger than the sum of its proper divisors (89991).

2788729 is an equidigital number, since it uses as much as digits as its factorization.

2788729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89990.

The product of its digits is 112896, while the sum is 43.

The square root of 2788729 is about 1669.9488016104. The cubic root of 2788729 is about 140.7566010195.

The spelling of 2788729 in words is "two million, seven hundred eighty-eight thousand, seven hundred twenty-nine".