28107949 has 4 divisors (see below), whose sum is σ = 28118880. Its totient is φ = 28097020.

The previous prime is 28107929. The next prime is 28107971. The reversal of 28107949 is 94970182.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28107949 - 2¹⁷ = 27976877 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28107929) 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, 744 + ... + 7534.

It is an arithmetic number, because the mean of its divisors is an integer number (7029720).

Almost surely, 2^28107949 is an apocalyptic number.

It is an amenable number.

28107949 is a deficient number, since it is larger than the sum of its proper divisors (10931).

28107949 is an equidigital number, since it uses as much as digits as its factorization.

28107949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10930.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 28107949 is about 5301.6930314759. The cubic root of 28107949 is about 304.0486309839.

The spelling of 28107949 in words is "twenty-eight million, one hundred seven thousand, nine hundred forty-nine".