28074949 has 4 divisors (see below), whose sum is σ = 32085664. Its totient is φ = 24064236.

The previous prime is 28074947. The next prime is 28074953. The reversal of 28074949 is 94947082.

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 not a de Polignac number, because 28074949 - 2¹ = 28074947 is a prime.

It is a super-2 number, since 2×28074949² = 1576405522705202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28074947) 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, 2005347 + ... + 2005360.

It is an arithmetic number, because the mean of its divisors is an integer number (8021416).

Almost surely, 2^28074949 is an apocalyptic number.

It is an amenable number.

28074949 is a deficient number, since it is larger than the sum of its proper divisors (4010715).

28074949 is an equidigital number, since it uses as much as digits as its factorization.

28074949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4010714.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 28074949 is about 5298.5799040875. The cubic root of 28074949 is about 303.9295954515.

The spelling of 28074949 in words is "twenty-eight million, seventy-four thousand, nine hundred forty-nine".