2828729 has 4 divisors (see below), whose sum is σ = 2853876. Its totient is φ = 2803584.

The previous prime is 2828717. The next prime is 2828731. The reversal of 2828729 is 9278282.

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

It can be written as a sum of positive squares in 2 ways, for example, as 139129 + 2689600 = 373^2 + 1640^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2828729 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2828692 and 2828701.

It is not an unprimeable number, because it can be changed into a prime (2828779) 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, 12404 + ... + 12629.

It is an arithmetic number, because the mean of its divisors is an integer number (713469).

2^2828729 is an apocalyptic number.

It is an amenable number.

2828729 is a deficient number, since it is larger than the sum of its proper divisors (25147).

2828729 is a wasteful number, since it uses less digits than its factorization.

2828729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25146.

The product of its digits is 32256, while the sum is 38.

The square root of 2828729 is about 1681.8825761628. The cubic root of 2828729 is about 141.4263873126.

The spelling of 2828729 in words is "two million, eight hundred twenty-eight thousand, seven hundred twenty-nine".