28918697 has 4 divisors (see below), whose sum is σ = 29392836. Its totient is φ = 28444560.

The previous prime is 28918693. The next prime is 28918699. The reversal of 28918697 is 79681982.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14600041 + 14318656 = 3821^2 + 3784^2 .

It is a cyclic number.

It is not a de Polignac number, because 28918697 - 2² = 28918693 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28918693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236978 + ... + 237099.

It is an arithmetic number, because the mean of its divisors is an integer number (7348209).

Almost surely, 2^28918697 is an apocalyptic number.

It is an amenable number.

28918697 is a deficient number, since it is larger than the sum of its proper divisors (474139).

28918697 is an equidigital number, since it uses as much as digits as its factorization.

28918697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474138.

The product of its digits is 435456, while the sum is 50.

The square root of 28918697 is about 5377.6107148063. The cubic root of 28918697 is about 306.9443005331.

The spelling of 28918697 in words is "twenty-eight million, nine hundred eighteen thousand, six hundred ninety-seven".