28055687 has 8 divisors (see below), whose sum is σ = 30678672. Its totient is φ = 25444800.

The previous prime is 28055681. The next prime is 28055693. The reversal of 28055687 is 78655082.

It is an interprime number because it is at equal distance from previous prime (28055681) and next prime (28055693).

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

It is a cyclic number.

It is not a de Polignac number, because 28055687 - 2⁶ = 28055623 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 (28055681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2237 + ... + 7817.

It is an arithmetic number, because the mean of its divisors is an integer number (3834834).

Almost surely, 2^28055687 is an apocalyptic number.

28055687 is a deficient number, since it is larger than the sum of its proper divisors (2622985).

28055687 is a wasteful number, since it uses less digits than its factorization.

28055687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6049.

The product of its (nonzero) digits is 134400, while the sum is 41.

The square root of 28055687 is about 5296.7619353715. The cubic root of 28055687 is about 303.8600716537.

The spelling of 28055687 in words is "twenty-eight million, fifty-five thousand, six hundred eighty-seven".