28912529 has 8 divisors (see below), whose sum is σ = 30744648. Its totient is φ = 27095040.

The previous prime is 28912523. The next prime is 28912531. The reversal of 28912529 is 92521982.

It can be written as a sum of positive squares in 4 ways, for example, as 21836929 + 7075600 = 4673^2 + 2660^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 28912529 - 2²⁴ = 12135313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28912492 and 28912501.

It is not an unprimeable number, because it can be changed into a prime (28912523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 569 + ... + 7625.

It is an arithmetic number, because the mean of its divisors is an integer number (3843081).

Almost surely, 2^28912529 is an apocalyptic number.

It is an amenable number.

28912529 is a deficient number, since it is larger than the sum of its proper divisors (1832119).

28912529 is a wasteful number, since it uses less digits than its factorization.

28912529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7315.

The product of its digits is 25920, while the sum is 38.

The square root of 28912529 is about 5377.0371953335. The cubic root of 28912529 is about 306.9224765085.

The spelling of 28912529 in words is "twenty-eight million, nine hundred twelve thousand, five hundred twenty-nine".