28611617 has 4 divisors (see below), whose sum is σ = 28624260. Its totient is φ = 28598976.

The previous prime is 28611601. The next prime is 28611659. The reversal of 28611617 is 71611682.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 19855936 + 8755681 = 4456^2 + 2959^2 .

It is a cyclic number.

It is not a de Polignac number, because 28611617 - 2⁴ = 28611601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28611917) 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, 1892 + ... + 7797.

It is an arithmetic number, because the mean of its divisors is an integer number (7156065).

Almost surely, 2^28611617 is an apocalyptic number.

It is an amenable number.

28611617 is a deficient number, since it is larger than the sum of its proper divisors (12643).

28611617 is an equidigital number, since it uses as much as digits as its factorization.

28611617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12642.

The product of its digits is 4032, while the sum is 32.

The square root of 28611617 is about 5348.9828004958. The cubic root of 28611617 is about 305.8539786311.

The spelling of 28611617 in words is "twenty-eight million, six hundred eleven thousand, six hundred seventeen".