28679531 has 8 divisors (see below), whose sum is σ = 30473280. Its totient is φ = 26914248.

The previous prime is 28679509. The next prime is 28679543. The reversal of 28679531 is 13597682.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28679531 is a prime.

It is a super-2 number, since 2×28679531² = 1645030996759922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28619531) 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, 5021 + ... + 9086.

It is an arithmetic number, because the mean of its divisors is an integer number (3809160).

Almost surely, 2^28679531 is an apocalyptic number.

28679531 is a deficient number, since it is larger than the sum of its proper divisors (1793749).

28679531 is a wasteful number, since it uses less digits than its factorization.

28679531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14233.

The product of its digits is 90720, while the sum is 41.

The square root of 28679531 is about 5355.3273476044. The cubic root of 28679531 is about 306.0957843024.

The spelling of 28679531 in words is "twenty-eight million, six hundred seventy-nine thousand, five hundred thirty-one".