28961587 has 4 divisors (see below), whose sum is σ = 29074536. Its totient is φ = 28848640.

The previous prime is 28961573. The next prime is 28961593. The reversal of 28961587 is 78516982.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28961587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28961287) 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, 56089 + ... + 56602.

It is an arithmetic number, because the mean of its divisors is an integer number (7268634).

Almost surely, 2^28961587 is an apocalyptic number.

28961587 is a deficient number, since it is larger than the sum of its proper divisors (112949).

28961587 is a wasteful number, since it uses less digits than its factorization.

28961587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112948.

The product of its digits is 241920, while the sum is 46.

The square root of 28961587 is about 5381.5970677857. The cubic root of 28961587 is about 307.0959710140.

The spelling of 28961587 in words is "twenty-eight million, nine hundred sixty-one thousand, five hundred eighty-seven".