28975529 has 4 divisors (see below), whose sum is σ = 31609680. Its totient is φ = 26341380.

The previous prime is 28975517. The next prime is 28975537. The reversal of 28975529 is 92557982.

28975529 = 1618² + 1619² + ... + 1628².

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 a de Polignac number, because none of the positive numbers 2^k-28975529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28975229) 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, 1317059 + ... + 1317080.

It is an arithmetic number, because the mean of its divisors is an integer number (7902420).

Almost surely, 2^28975529 is an apocalyptic number.

It is an amenable number.

28975529 is a deficient number, since it is larger than the sum of its proper divisors (2634151).

28975529 is a wasteful number, since it uses less digits than its factorization.

28975529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2634150.

The product of its digits is 453600, while the sum is 47.

The square root of 28975529 is about 5382.8922523119. The cubic root of 28975529 is about 307.1452413938.

The spelling of 28975529 in words is "twenty-eight million, nine hundred seventy-five thousand, five hundred twenty-nine".