28961697 has 4 divisors (see below), whose sum is σ = 38615600. Its totient is φ = 19307796.

The previous prime is 28961689. The next prime is 28961701. The reversal of 28961697 is 79616982.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 28961697 - 2³ = 28961689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28961617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4826947 + ... + 4826952.

It is an arithmetic number, because the mean of its divisors is an integer number (9653900).

Almost surely, 2^28961697 is an apocalyptic number.

It is an amenable number.

28961697 is a deficient number, since it is larger than the sum of its proper divisors (9653903).

28961697 is an equidigital number, since it uses as much as digits as its factorization.

28961697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9653902.

The product of its digits is 326592, while the sum is 48.

The square root of 28961697 is about 5381.6072877905. The cubic root of 28961697 is about 307.0963598108.

The spelling of 28961697 in words is "twenty-eight million, nine hundred sixty-one thousand, six hundred ninety-seven".