28356887 has 8 divisors (see below), whose sum is σ = 31039680. Its totient is φ = 25745760.

The previous prime is 28356877. The next prime is 28356929. The reversal of 28356887 is 78865382.

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 28356887 - 2¹⁰ = 28355863 is a prime.

It is a super-2 number, since 2×28356887² = 1608226080661538, 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 (28356817) 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, 17087 + ... + 18672.

It is an arithmetic number, because the mean of its divisors is an integer number (3879960).

Almost surely, 2^28356887 is an apocalyptic number.

28356887 is a deficient number, since it is larger than the sum of its proper divisors (2682793).

28356887 is a wasteful number, since it uses less digits than its factorization.

28356887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35833.

The product of its digits is 645120, while the sum is 47.

The square root of 28356887 is about 5325.1184963341. The cubic root of 28356887 is about 304.9435961272.

The spelling of 28356887 in words is "twenty-eight million, three hundred fifty-six thousand, eight hundred eighty-seven".