28513747 has 4 divisors (see below), whose sum is σ = 28684656. Its totient is φ = 28342840.

The previous prime is 28513741. The next prime is 28513759. The reversal of 28513747 is 74731582.

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 28513747 - 2³ = 28513739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28513741) 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, 85204 + ... + 85537.

It is an arithmetic number, because the mean of its divisors is an integer number (7171164).

Almost surely, 2^28513747 is an apocalyptic number.

28513747 is a deficient number, since it is larger than the sum of its proper divisors (170909).

28513747 is a wasteful number, since it uses less digits than its factorization.

28513747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170908.

The product of its digits is 47040, while the sum is 37.

The square root of 28513747 is about 5339.8264953086. The cubic root of 28513747 is about 305.5048416011.

The spelling of 28513747 in words is "twenty-eight million, five hundred thirteen thousand, seven hundred forty-seven".