28918917 has 16 divisors (see below), whose sum is σ = 42965760. Its totient is φ = 19224000.

The previous prime is 28918907. The next prime is 28918933. The reversal of 28918917 is 71981982.

It is not a de Polignac number, because 28918917 - 2¹⁰ = 28917893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28918907) 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 15 ways as a sum of consecutive naturals, for example, 9492 + ... + 12162.

It is an arithmetic number, because the mean of its divisors is an integer number (2685360).

Almost surely, 2^28918917 is an apocalyptic number.

28918917 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

28918917 is a deficient number, since it is larger than the sum of its proper divisors (14046843).

28918917 is a wasteful number, since it uses less digits than its factorization.

28918917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3081 (or 3075 counting only the distinct ones).

The product of its digits is 72576, while the sum is 45.

The square root of 28918917 is about 5377.6311699483. The cubic root of 28918917 is about 306.9450788943.

The spelling of 28918917 in words is "twenty-eight million, nine hundred eighteen thousand, nine hundred seventeen".