28917895 has 4 divisors (see below), whose sum is σ = 34701480. Its totient is φ = 23134312.

The previous prime is 28917893. The next prime is 28917919. The reversal of 28917895 is 59871982.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 59871982 = 2 ⋅29935991.

It is a cyclic number.

It is not a de Polignac number, because 28917895 - 2¹ = 28917893 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28917893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2891785 + ... + 2891794.

It is an arithmetic number, because the mean of its divisors is an integer number (8675370).

Almost surely, 2^28917895 is an apocalyptic number.

28917895 is a deficient number, since it is larger than the sum of its proper divisors (5783585).

28917895 is an equidigital number, since it uses as much as digits as its factorization.

28917895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5783584.

The product of its digits is 362880, while the sum is 49.

The square root of 28917895 is about 5377.5361458571. The cubic root of 28917895 is about 306.9414630193.

The spelling of 28917895 in words is "twenty-eight million, nine hundred seventeen thousand, eight hundred ninety-five".