28796729 has 4 divisors (see below), whose sum is σ = 31011876. Its totient is φ = 26581584.

The previous prime is 28796717. The next prime is 28796749. The reversal of 28796729 is 92769782.

It is a happy number.

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 7155625 + 21641104 = 2675^2 + 4652^2 .

It is a cyclic number.

It is not a de Polignac number, because 28796729 - 2¹² = 28792633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28796749) 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, 1107554 + ... + 1107579.

It is an arithmetic number, because the mean of its divisors is an integer number (7752969).

Almost surely, 2^28796729 is an apocalyptic number.

It is an amenable number.

28796729 is a deficient number, since it is larger than the sum of its proper divisors (2215147).

28796729 is a wasteful number, since it uses less digits than its factorization.

28796729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2215146.

The product of its digits is 762048, while the sum is 50.

The square root of 28796729 is about 5366.2583799143. The cubic root of 28796729 is about 306.5121678970.

The spelling of 28796729 in words is "twenty-eight million, seven hundred ninety-six thousand, seven hundred twenty-nine".