28380787 has 4 divisors (see below), whose sum is σ = 28646136. Its totient is φ = 28115440.

The previous prime is 28380773. The next prime is 28380791. The reversal of 28380787 is 78708382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78708382 = 2 ⋅39354191.

It is a cyclic number.

It is not a de Polignac number, because 28380787 - 2⁷ = 28380659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28380707) 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, 132514 + ... + 132727.

It is an arithmetic number, because the mean of its divisors is an integer number (7161534).

Almost surely, 2^28380787 is an apocalyptic number.

28380787 is a deficient number, since it is larger than the sum of its proper divisors (265349).

28380787 is a wasteful number, since it uses less digits than its factorization.

28380787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265348.

The product of its (nonzero) digits is 150528, while the sum is 43.

The square root of 28380787 is about 5327.3621052074. The cubic root of 28380787 is about 305.0292438143.

The spelling of 28380787 in words is "twenty-eight million, three hundred eighty thousand, seven hundred eighty-seven".