28747663 has 12 divisors (see below), whose sum is σ = 35409312. Its totient is φ = 23190720.

The previous prime is 28747651. The next prime is 28747679. The reversal of 28747663 is 36674782.

It is a happy number.

It is not a de Polignac number, because 28747663 - 2¹³ = 28739471 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 (28747063) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16423 + ... + 18088.

It is an arithmetic number, because the mean of its divisors is an integer number (2950776).

Almost surely, 2^28747663 is an apocalyptic number.

28747663 is a deficient number, since it is larger than the sum of its proper divisors (6661649).

28747663 is a wasteful number, since it uses less digits than its factorization.

28747663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34542 (or 34535 counting only the distinct ones).

The product of its digits is 338688, while the sum is 43.

The square root of 28747663 is about 5361.6847165793. The cubic root of 28747663 is about 306.3379828841.

The spelling of 28747663 in words is "twenty-eight million, seven hundred forty-seven thousand, six hundred sixty-three".