28820617 has 4 divisors (see below), whose sum is σ = 32937856. Its totient is φ = 24703380.

The previous prime is 28820569. The next prime is 28820629. The reversal of 28820617 is 71602882.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28820617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28823617) 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, 2058609 + ... + 2058622.

It is an arithmetic number, because the mean of its divisors is an integer number (8234464).

Almost surely, 2^28820617 is an apocalyptic number.

It is an amenable number.

28820617 is a deficient number, since it is larger than the sum of its proper divisors (4117239).

28820617 is an equidigital number, since it uses as much as digits as its factorization.

28820617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4117238.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 28820617 is about 5368.4836779113. The cubic root of 28820617 is about 306.5968990364.

The spelling of 28820617 in words is "twenty-eight million, eight hundred twenty thousand, six hundred seventeen".