28616647 has 4 divisors (see below), whose sum is σ = 29314656. Its totient is φ = 27918640.

The previous prime is 28616639. The next prime is 28616663. The reversal of 28616647 is 74661682.

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

It is a cyclic number.

It is not a de Polignac number, because 28616647 - 2³ = 28616639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28616617) 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, 348943 + ... + 349024.

It is an arithmetic number, because the mean of its divisors is an integer number (7328664).

Almost surely, 2^28616647 is an apocalyptic number.

28616647 is a deficient number, since it is larger than the sum of its proper divisors (698009).

28616647 is an equidigital number, since it uses as much as digits as its factorization.

28616647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698008.

The product of its digits is 96768, while the sum is 40.

The square root of 28616647 is about 5349.4529626869. The cubic root of 28616647 is about 305.8719009010.

The spelling of 28616647 in words is "twenty-eight million, six hundred sixteen thousand, six hundred forty-seven".