28874549 has 4 divisors (see below), whose sum is σ = 31499520. Its totient is φ = 26249580.

The previous prime is 28874539. The next prime is 28874567. The reversal of 28874549 is 94547882.

It is a happy number.

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-28874549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28874539) 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, 1312469 + ... + 1312490.

It is an arithmetic number, because the mean of its divisors is an integer number (7874880).

Almost surely, 2^28874549 is an apocalyptic number.

It is an amenable number.

28874549 is a deficient number, since it is larger than the sum of its proper divisors (2624971).

28874549 is a wasteful number, since it uses less digits than its factorization.

28874549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2624970.

The product of its digits is 645120, while the sum is 47.

The square root of 28874549 is about 5373.5043500494. The cubic root of 28874549 is about 306.7880247209.

The spelling of 28874549 in words is "twenty-eight million, eight hundred seventy-four thousand, five hundred forty-nine".