28746687 has 4 divisors (see below), whose sum is σ = 38328920. Its totient is φ = 19164456.

The previous prime is 28746673. The next prime is 28746691. The reversal of 28746687 is 78664782.

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

It is not a de Polignac number, because 28746687 - 2⁶ = 28746623 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 (28746607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4791112 + ... + 4791117.

It is an arithmetic number, because the mean of its divisors is an integer number (9582230).

Almost surely, 2^28746687 is an apocalyptic number.

28746687 is a deficient number, since it is larger than the sum of its proper divisors (9582233).

28746687 is an equidigital number, since it uses as much as digits as its factorization.

28746687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9582232.

The product of its digits is 903168, while the sum is 48.

The square root of 28746687 is about 5361.5936996382. The cubic root of 28746687 is about 306.3345160603.

The spelling of 28746687 in words is "twenty-eight million, seven hundred forty-six thousand, six hundred eighty-seven".