28113749 has 4 divisors (see below), whose sum is σ = 29593440. Its totient is φ = 26634060.

The previous prime is 28113739. The next prime is 28113781. The reversal of 28113749 is 94731182.

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 a de Polignac number, because none of the positive numbers 2^k-28113749 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28113719) 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, 739817 + ... + 739854.

It is an arithmetic number, because the mean of its divisors is an integer number (7398360).

Almost surely, 2^28113749 is an apocalyptic number.

It is an amenable number.

28113749 is a deficient number, since it is larger than the sum of its proper divisors (1479691).

28113749 is a wasteful number, since it uses less digits than its factorization.

28113749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1479690.

The product of its digits is 12096, while the sum is 35.

The square root of 28113749 is about 5302.2399983403. The cubic root of 28113749 is about 304.0695427525.

The spelling of 28113749 in words is "twenty-eight million, one hundred thirteen thousand, seven hundred forty-nine".