28642087 has 4 divisors (see below), whose sum is σ = 28678216. Its totient is φ = 28605960.

The previous prime is 28642079. The next prime is 28642091. The reversal of 28642087 is 78024682.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78024682 = 2 ⋅39012341.

It is a cyclic number.

It is not a de Polignac number, because 28642087 - 2³ = 28642079 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 (28642007) 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, 16848 + ... + 18469.

It is an arithmetic number, because the mean of its divisors is an integer number (7169554).

Almost surely, 2^28642087 is an apocalyptic number.

28642087 is a deficient number, since it is larger than the sum of its proper divisors (36129).

28642087 is an equidigital number, since it uses as much as digits as its factorization.

28642087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36128.

The product of its (nonzero) digits is 43008, while the sum is 37.

The square root of 28642087 is about 5351.8302476816. The cubic root of 28642087 is about 305.9625133853.

The spelling of 28642087 in words is "twenty-eight million, six hundred forty-two thousand, eighty-seven".