28711678 has 4 divisors (see below), whose sum is σ = 43067520. Its totient is φ = 14355838.

The previous prime is 28711651. The next prime is 28711687. The reversal of 28711678 is 87611782.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 28711678.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7177918 + ... + 7177921.

It is an arithmetic number, because the mean of its divisors is an integer number (10766880).

Almost surely, 2^28711678 is an apocalyptic number.

28711678 is a deficient number, since it is larger than the sum of its proper divisors (14355842).

28711678 is a wasteful number, since it uses less digits than its factorization.

28711678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14355841.

The product of its digits is 37632, while the sum is 40.

The square root of 28711678 is about 5358.3279108319. The cubic root of 28711678 is about 306.2101095898.

The spelling of 28711678 in words is "twenty-eight million, seven hundred eleven thousand, six hundred seventy-eight".