28885729 has 4 divisors (see below), whose sum is σ = 29093680. Its totient is φ = 28677780.

The previous prime is 28885721. The next prime is 28885739. The reversal of 28885729 is 92758882.

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 28885729 - 2³ = 28885721 is a prime.

It is a super-2 number, since 2×28885729² = 1668770679722882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28885721) 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, 103767 + ... + 104044.

It is an arithmetic number, because the mean of its divisors is an integer number (7273420).

Almost surely, 2^28885729 is an apocalyptic number.

It is an amenable number.

28885729 is a deficient number, since it is larger than the sum of its proper divisors (207951).

28885729 is a wasteful number, since it uses less digits than its factorization.

28885729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207950.

The product of its digits is 645120, while the sum is 49.

The square root of 28885729 is about 5374.5445388423. The cubic root of 28885729 is about 306.8276149212.

The spelling of 28885729 in words is "twenty-eight million, eight hundred eighty-five thousand, seven hundred twenty-nine".