28617647 has 6 divisors (see below), whose sum is σ = 30400368. Its totient is φ = 26933984.

The previous prime is 28617583. The next prime is 28617649. The reversal of 28617647 is 74671682.

It is not a de Polignac number, because 28617647 - 2⁶ = 28617583 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 (28617649) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 49223 + ... + 49800.

It is an arithmetic number, because the mean of its divisors is an integer number (5066728).

Almost surely, 2^28617647 is an apocalyptic number.

28617647 is a deficient number, since it is larger than the sum of its proper divisors (1782721).

28617647 is an equidigital number, since it uses as much as digits as its factorization.

28617647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99057 (or 99040 counting only the distinct ones).

The product of its digits is 112896, while the sum is 41.

The square root of 28617647 is about 5349.5464293714. The cubic root of 28617647 is about 305.8754637262.

The spelling of 28617647 in words is "twenty-eight million, six hundred seventeen thousand, six hundred forty-seven".