28393729 has 16 divisors (see below), whose sum is σ = 35475328. Its totient is φ = 22125312.

The previous prime is 28393721. The next prime is 28393769. The reversal of 28393729 is 92739382.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28393729 - 2³ = 28393721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28393721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3769 + ... + 8425.

It is an arithmetic number, because the mean of its divisors is an integer number (2217208).

Almost surely, 2^28393729 is an apocalyptic number.

It is an amenable number.

28393729 is a deficient number, since it is larger than the sum of its proper divisors (7081599).

28393729 is a wasteful number, since it uses less digits than its factorization.

28393729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4744.

The product of its digits is 163296, while the sum is 43.

The square root of 28393729 is about 5328.5766392161. The cubic root of 28393729 is about 305.0756025071.

The spelling of 28393729 in words is "twenty-eight million, three hundred ninety-three thousand, seven hundred twenty-nine".