28874137 has 4 divisors (see below), whose sum is σ = 28901556. Its totient is φ = 28846720.

The previous prime is 28874101. The next prime is 28874141. The reversal of 28874137 is 73147882.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73147882 = 2 ⋅36573941.

It can be written as a sum of positive squares in 2 ways, for example, as 18913801 + 9960336 = 4349^2 + 3156^2 .

It is a cyclic number.

It is not a de Polignac number, because 28874137 - 2⁷ = 28874009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28874137.

It is not an unprimeable number, because it can be changed into a prime (28874147) 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, 12064 + ... + 14257.

It is an arithmetic number, because the mean of its divisors is an integer number (7225389).

Almost surely, 2^28874137 is an apocalyptic number.

It is an amenable number.

28874137 is a deficient number, since it is larger than the sum of its proper divisors (27419).

28874137 is a wasteful number, since it uses less digits than its factorization.

28874137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27418.

The product of its digits is 75264, while the sum is 40.

The square root of 28874137 is about 5373.4660136638. The cubic root of 28874137 is about 306.7865655666.

The spelling of 28874137 in words is "twenty-eight million, eight hundred seventy-four thousand, one hundred thirty-seven".