28383877 has 4 divisors (see below), whose sum is σ = 28540876. Its totient is φ = 28226880.

The previous prime is 28383871. The next prime is 28383881. The reversal of 28383877 is 77838382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77838382 = 2 ⋅38919191.

It can be written as a sum of positive squares in 2 ways, for example, as 15610401 + 12773476 = 3951^2 + 3574^2 .

It is a cyclic number.

It is not a de Polignac number, because 28383877 - 2¹⁵ = 28351109 is a prime.

It is a super-2 number, since 2×28383877² = 1611288947102258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28383871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78228 + ... + 78589.

It is an arithmetic number, because the mean of its divisors is an integer number (7135219).

Almost surely, 2^28383877 is an apocalyptic number.

It is an amenable number.

28383877 is a deficient number, since it is larger than the sum of its proper divisors (156999).

28383877 is a wasteful number, since it uses less digits than its factorization.

28383877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156998.

The product of its digits is 451584, while the sum is 46.

The square root of 28383877 is about 5327.6521095132. The cubic root of 28383877 is about 305.0403135820.

The spelling of 28383877 in words is "twenty-eight million, three hundred eighty-three thousand, eight hundred seventy-seven".