28975697 has 4 divisors (see below), whose sum is σ = 29028276. Its totient is φ = 28923120.

The previous prime is 28975693. The next prime is 28975717. The reversal of 28975697 is 79657982.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79657982 = 2 ⋅39828991.

It can be written as a sum of positive squares in 2 ways, for example, as 7529536 + 21446161 = 2744^2 + 4631^2 .

It is a cyclic number.

It is not a de Polignac number, because 28975697 - 2² = 28975693 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28975693) 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, 25454 + ... + 26567.

It is an arithmetic number, because the mean of its divisors is an integer number (7257069).

Almost surely, 2^28975697 is an apocalyptic number.

It is an amenable number.

28975697 is a deficient number, since it is larger than the sum of its proper divisors (52579).

28975697 is an equidigital number, since it uses as much as digits as its factorization.

28975697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52578.

The product of its digits is 1905120, while the sum is 53.

The square root of 28975697 is about 5382.9078572831. The cubic root of 28975697 is about 307.1458350016.

The spelling of 28975697 in words is "twenty-eight million, nine hundred seventy-five thousand, six hundred ninety-seven".