28694187 has 12 divisors (see below), whose sum is σ = 41747160. Its totient is φ = 18991008.

The previous prime is 28694167. The next prime is 28694191. The reversal of 28694187 is 78149682.

It is not a de Polignac number, because 28694187 - 2¹² = 28690091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28694117) 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, 10218 + ... + 12719.

It is an arithmetic number, because the mean of its divisors is an integer number (3478930).

Almost surely, 2^28694187 is an apocalyptic number.

28694187 is a deficient number, since it is larger than the sum of its proper divisors (13052973).

28694187 is a wasteful number, since it uses less digits than its factorization.

28694187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23082 (or 23079 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 28694187 is about 5356.6955298953. The cubic root of 28694187 is about 306.1479164409.

It can be divided in two parts, 2869 and 4187, that added together give a square (7056 = 84²).

The spelling of 28694187 in words is "twenty-eight million, six hundred ninety-four thousand, one hundred eighty-seven".