28872149 has 4 divisors (see below), whose sum is σ = 28885164. Its totient is φ = 28859136.

The previous prime is 28872127. The next prime is 28872161. The reversal of 28872149 is 94127882.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8305924 + 20566225 = 2882^2 + 4535^2 .

It is a cyclic number.

It is not a de Polignac number, because 28872149 - 2¹² = 28868053 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 (28874149) 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, 2252 + ... + 7925.

It is an arithmetic number, because the mean of its divisors is an integer number (7221291).

Almost surely, 2^28872149 is an apocalyptic number.

It is an amenable number.

28872149 is a deficient number, since it is larger than the sum of its proper divisors (13015).

28872149 is a wasteful number, since it uses less digits than its factorization.

28872149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13014.

The product of its digits is 64512, while the sum is 41.

The square root of 28872149 is about 5373.2810274543. The cubic root of 28872149 is about 306.7795245978.

The spelling of 28872149 in words is "twenty-eight million, eight hundred seventy-two thousand, one hundred forty-nine".