28247661 has 48 divisors (see below), whose sum is σ = 47087040. Its totient is φ = 16174080.

The previous prime is 28247651. The next prime is 28247671. The reversal of 28247661 is 16674282.

It is an interprime number because it is at equal distance from previous prime (28247651) and next prime (28247671).

It is not a de Polignac number, because 28247661 - 2⁷ = 28247533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28247651) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 215566 + ... + 215696.

It is an arithmetic number, because the mean of its divisors is an integer number (980980).

Almost surely, 2^28247661 is an apocalyptic number.

It is an amenable number.

28247661 is a deficient number, since it is larger than the sum of its proper divisors (18839379).

28247661 is a wasteful number, since it uses less digits than its factorization.

28247661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266 (or 263 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 28247661 is about 5314.8528672015. The cubic root of 28247661 is about 304.5515617183.

The spelling of 28247661 in words is "twenty-eight million, two hundred forty-seven thousand, six hundred sixty-one".