28873137 has 4 divisors (see below), whose sum is σ = 38497520. Its totient is φ = 19248756.

The previous prime is 28873057. The next prime is 28873139. The reversal of 28873137 is 73137882.

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 28873137 - 2¹⁰ = 28872113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28873095 and 28873104.

It is not an unprimeable number, because it can be changed into a prime (28873139) 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, 4812187 + ... + 4812192.

It is an arithmetic number, because the mean of its divisors is an integer number (9624380).

Almost surely, 2^28873137 is an apocalyptic number.

It is an amenable number.

28873137 is a deficient number, since it is larger than the sum of its proper divisors (9624383).

28873137 is an equidigital number, since it uses as much as digits as its factorization.

28873137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9624382.

The product of its digits is 56448, while the sum is 39.

The square root of 28873137 is about 5373.3729630466. The cubic root of 28873137 is about 306.7830238722.

The spelling of 28873137 in words is "twenty-eight million, eight hundred seventy-three thousand, one hundred thirty-seven".