28680531 has 16 divisors (see below), whose sum is σ = 41806848. Its totient is φ = 17344800.

The previous prime is 28680497. The next prime is 28680541. The reversal of 28680531 is 13508682.

It is a happy number.

It is not a de Polignac number, because 28680531 - 2⁶ = 28680467 is a prime.

It is a super-2 number, since 2×28680531² = 1645145716883922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 28680492 and 28680501.

It is not an unprimeable number, because it can be changed into a prime (28680541) 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 15 ways as a sum of consecutive naturals, for example, 28446 + ... + 29436.

It is an arithmetic number, because the mean of its divisors is an integer number (2612928).

Almost surely, 2^28680531 is an apocalyptic number.

28680531 is a deficient number, since it is larger than the sum of its proper divisors (13126317).

28680531 is a wasteful number, since it uses less digits than its factorization.

28680531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1882.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 28680531 is about 5355.4207117649. The cubic root of 28680531 is about 306.0993419178.

The spelling of 28680531 in words is "twenty-eight million, six hundred eighty thousand, five hundred thirty-one".