28687823 has 16 divisors (see below), whose sum is σ = 31570560. Its totient is φ = 25958400.

The previous prime is 28687817. The next prime is 28687843. The reversal of 28687823 is 32878682.

It is a cyclic number.

It is not a de Polignac number, because 28687823 - 2⁴ = 28687807 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 (28687843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54803 + ... + 55323.

It is an arithmetic number, because the mean of its divisors is an integer number (1973160).

Almost surely, 2^28687823 is an apocalyptic number.

28687823 is a deficient number, since it is larger than the sum of its proper divisors (2882737).

28687823 is a wasteful number, since it uses less digits than its factorization.

28687823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658.

The product of its digits is 258048, while the sum is 44.

The square root of 28687823 is about 5356.1014740201. The cubic root of 28687823 is about 306.1252815498.

The spelling of 28687823 in words is "twenty-eight million, six hundred eighty-seven thousand, eight hundred twenty-three".