28684031 has 8 divisors (see below), whose sum is σ = 29172480. Its totient is φ = 28198872.

The previous prime is 28684009. The next prime is 28684037. The reversal of 28684031 is 13048682.

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-28684031 is a prime.

It is a super-2 number, since 2×28684031² = 1645547268817922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28684037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21716 + ... + 22998.

It is an arithmetic number, because the mean of its divisors is an integer number (3646560).

Almost surely, 2^28684031 is an apocalyptic number.

28684031 is a deficient number, since it is larger than the sum of its proper divisors (488449).

28684031 is a wasteful number, since it uses less digits than its factorization.

28684031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1645.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 28684031 is about 5355.7474735092. The cubic root of 28684031 is about 306.1117929206. Note that the first 3 decimals are identical.

The spelling of 28684031 in words is "twenty-eight million, six hundred eighty-four thousand, thirty-one".