28713937 has 4 divisors (see below), whose sum is σ = 32815936. Its totient is φ = 24611940.

The previous prime is 28713929. The next prime is 28713941. The reversal of 28713937 is 73931782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28713937 - 2³ = 28713929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28713937.

It is not an unprimeable number, because it can be changed into a prime (28713947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2050989 + ... + 2051002.

It is an arithmetic number, because the mean of its divisors is an integer number (8203984).

Almost surely, 2^28713937 is an apocalyptic number.

It is an amenable number.

28713937 is a deficient number, since it is larger than the sum of its proper divisors (4101999).

28713937 is an equidigital number, since it uses as much as digits as its factorization.

28713937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4101998.

The product of its digits is 63504, while the sum is 40.

The square root of 28713937 is about 5358.5387000562. The cubic root of 28713937 is about 306.2181401259.

The spelling of 28713937 in words is "twenty-eight million, seven hundred thirteen thousand, nine hundred thirty-seven".