28587861 has 12 divisors (see below), whose sum is σ = 41376192. Its totient is φ = 19020456.

The previous prime is 28587857. The next prime is 28587883. The reversal of 28587861 is 16878582.

28587861 is a `hidden beast` number, since 2 + 8 + 587 + 8 + 61 = 666.

It is not a de Polignac number, because 28587861 - 2² = 28587857 is a prime.

It is a super-3 number, since 3×28587861³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28587851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2020 + ... + 7826.

It is an arithmetic number, because the mean of its divisors is an integer number (3448016).

Almost surely, 2^28587861 is an apocalyptic number.

It is an amenable number.

28587861 is a deficient number, since it is larger than the sum of its proper divisors (12788331).

28587861 is a wasteful number, since it uses less digits than its factorization.

28587861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6360 (or 6357 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 28587861 is about 5346.7617302438. The cubic root of 28587861 is about 305.7693058101.

The spelling of 28587861 in words is "twenty-eight million, five hundred eighty-seven thousand, eight hundred sixty-one".