28718071 has 4 divisors (see below), whose sum is σ = 28738944. Its totient is φ = 28697200.

The previous prime is 28718029. The next prime is 28718089. The reversal of 28718071 is 17081782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17081782 = 2 ⋅8540891.

It is a cyclic number.

It is not a de Polignac number, because 28718071 - 2⁷ = 28717943 is a prime.

It is a super-2 number, since 2×28718071² = 1649455203922082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28718021) 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, 8215 + ... + 11176.

It is an arithmetic number, because the mean of its divisors is an integer number (7184736).

Almost surely, 2^28718071 is an apocalyptic number.

28718071 is a deficient number, since it is larger than the sum of its proper divisors (20873).

28718071 is a wasteful number, since it uses less digits than its factorization.

28718071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20872.

The product of its (nonzero) digits is 6272, while the sum is 34.

The square root of 28718071 is about 5358.9244256660. The cubic root of 28718071 is about 306.2328350229.

The spelling of 28718071 in words is "twenty-eight million, seven hundred eighteen thousand, seventy-one".