28747747 has 4 divisors (see below), whose sum is σ = 32854576. Its totient is φ = 24640920.

The previous prime is 28747717. The next prime is 28747759. The reversal of 28747747 is 74774782.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28747747 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28747697 and 28747706.

It is not an unprimeable number, because it can be changed into a prime (28747717) 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, 2053404 + ... + 2053417.

It is an arithmetic number, because the mean of its divisors is an integer number (8213644).

Almost surely, 2^28747747 is an apocalyptic number.

28747747 is a deficient number, since it is larger than the sum of its proper divisors (4106829).

28747747 is an equidigital number, since it uses as much as digits as its factorization.

28747747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4106828.

The product of its digits is 614656, while the sum is 46.

The square root of 28747747 is about 5361.6925499323. The cubic root of 28747747 is about 306.3382812547.

The spelling of 28747747 in words is "twenty-eight million, seven hundred forty-seven thousand, seven hundred forty-seven".