28377861 has 4 divisors (see below), whose sum is σ = 37837152. Its totient is φ = 18918572.

The previous prime is 28377851. The next prime is 28377911. The reversal of 28377861 is 16877382.

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 a cyclic number.

It is not a de Polignac number, because 28377861 - 2⁵ = 28377829 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28377851) 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, 4729641 + ... + 4729646.

It is an arithmetic number, because the mean of its divisors is an integer number (9459288).

Almost surely, 2^28377861 is an apocalyptic number.

It is an amenable number.

28377861 is a deficient number, since it is larger than the sum of its proper divisors (9459291).

28377861 is an equidigital number, since it uses as much as digits as its factorization.

28377861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9459290.

The product of its digits is 112896, while the sum is 42.

The square root of 28377861 is about 5327.0874781629. The cubic root of 28377861 is about 305.0187608275.

The spelling of 28377861 in words is "twenty-eight million, three hundred seventy-seven thousand, eight hundred sixty-one".