28687111 has 4 divisors (see below), whose sum is σ = 28798992. Its totient is φ = 28575232.

The previous prime is 28687097. The next prime is 28687117. The reversal of 28687111 is 11178682.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28687111 - 2¹³ = 28678919 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 (28687117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55555 + ... + 56068.

It is an arithmetic number, because the mean of its divisors is an integer number (7199748).

Almost surely, 2^28687111 is an apocalyptic number.

28687111 is a deficient number, since it is larger than the sum of its proper divisors (111881).

28687111 is a wasteful number, since it uses less digits than its factorization.

28687111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111880.

The product of its digits is 5376, while the sum is 34.

The square root of 28687111 is about 5356.0350073539. The cubic root of 28687111 is about 306.1227489654.

The spelling of 28687111 in words is "twenty-eight million, six hundred eighty-seven thousand, one hundred eleven".