28078129 has 4 divisors (see below), whose sum is σ = 28675584. Its totient is φ = 27480676.

The previous prime is 28078123. The next prime is 28078151. The reversal of 28078129 is 92187082.

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 28078129 - 2³ = 28078121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28078121) 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, 298657 + ... + 298750.

It is an arithmetic number, because the mean of its divisors is an integer number (7168896).

Almost surely, 2^28078129 is an apocalyptic number.

It is an amenable number.

28078129 is a deficient number, since it is larger than the sum of its proper divisors (597455).

28078129 is an equidigital number, since it uses as much as digits as its factorization.

28078129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 597454.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 28078129 is about 5298.8799759949. The cubic root of 28078129 is about 303.9410702082.

The spelling of 28078129 in words is "twenty-eight million, seventy-eight thousand, one hundred twenty-nine".