28872547 has 4 divisors (see below), whose sum is σ = 31497336. Its totient is φ = 26247760.

The previous prime is 28872539. The next prime is 28872551. The reversal of 28872547 is 74527882.

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

It is not a de Polignac number, because 28872547 - 2³ = 28872539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28872587) 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, 1312378 + ... + 1312399.

It is an arithmetic number, because the mean of its divisors is an integer number (7874334).

Almost surely, 2^28872547 is an apocalyptic number.

28872547 is a deficient number, since it is larger than the sum of its proper divisors (2624789).

28872547 is a wasteful number, since it uses less digits than its factorization.

28872547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2624788.

The product of its digits is 250880, while the sum is 43.

The square root of 28872547 is about 5373.3180624266. The cubic root of 28872547 is about 306.7809342341.

The spelling of 28872547 in words is "twenty-eight million, eight hundred seventy-two thousand, five hundred forty-seven".