28129079 has 8 divisors (see below), whose sum is σ = 31145088. Its totient is φ = 25189560.

The previous prime is 28129021. The next prime is 28129091. The reversal of 28129079 is 97092182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28129079 - 2¹⁶ = 28063543 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 (28122079) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18347 + ... + 19820.

It is an arithmetic number, because the mean of its divisors is an integer number (3893136).

Almost surely, 2^28129079 is an apocalyptic number.

28129079 is a deficient number, since it is larger than the sum of its proper divisors (3016009).

28129079 is a wasteful number, since it uses less digits than its factorization.

28129079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38245.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 28129079 is about 5303.6854167645. The cubic root of 28129079 is about 304.1248008765.

The spelling of 28129079 in words is "twenty-eight million, one hundred twenty-nine thousand, seventy-nine".