28820687 has 8 divisors (see below), whose sum is σ = 32996256. Its totient is φ = 24659712.

The previous prime is 28820683. The next prime is 28820699. The reversal of 28820687 is 78602882.

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

It is not a de Polignac number, because 28820687 - 2² = 28820683 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28820683) 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, 983 + ... + 7655.

It is an arithmetic number, because the mean of its divisors is an integer number (4124532).

Almost surely, 2^28820687 is an apocalyptic number.

28820687 is a deficient number, since it is larger than the sum of its proper divisors (4175569).

28820687 is an equidigital number, since it uses as much as digits as its factorization.

28820687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7297.

The product of its (nonzero) digits is 86016, while the sum is 41.

The square root of 28820687 is about 5368.4901974391. The cubic root of 28820687 is about 306.5971472588.

The spelling of 28820687 in words is "twenty-eight million, eight hundred twenty thousand, six hundred eighty-seven".