28104729 has 4 divisors (see below), whose sum is σ = 37472976. Its totient is φ = 18736484.

The previous prime is 28104701. The next prime is 28104733. The reversal of 28104729 is 92740182.

It is a happy number.

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 28104729 - 2¹⁵ = 28071961 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28104729.

It is not an unprimeable number, because it can be changed into a prime (28103729) 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, 4684119 + ... + 4684124.

It is an arithmetic number, because the mean of its divisors is an integer number (9368244).

Almost surely, 2^28104729 is an apocalyptic number.

It is an amenable number.

28104729 is a deficient number, since it is larger than the sum of its proper divisors (9368247).

28104729 is an equidigital number, since it uses as much as digits as its factorization.

28104729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9368246.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 28104729 is about 5301.3893461997. The cubic root of 28104729 is about 304.0370201050.

The spelling of 28104729 in words is "twenty-eight million, one hundred four thousand, seven hundred twenty-nine".