28709529 has 8 divisors (see below), whose sum is σ = 38326080. Its totient is φ = 19116336.

The previous prime is 28709519. The next prime is 28709573. The reversal of 28709529 is 92590782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28709529 - 2⁹ = 28709017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28709519) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2734 + ... + 8055.

It is an arithmetic number, because the mean of its divisors is an integer number (4790760).

Almost surely, 2^28709529 is an apocalyptic number.

It is an amenable number.

28709529 is a deficient number, since it is larger than the sum of its proper divisors (9616551).

28709529 is a wasteful number, since it uses less digits than its factorization.

28709529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11679.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 28709529 is about 5358.1273781052. The cubic root of 28709529 is about 306.2024697026.

The spelling of 28709529 in words is "twenty-eight million, seven hundred nine thousand, five hundred twenty-nine".