28129995 has 12 divisors (see below), whose sum is σ = 48758736. Its totient is φ = 15002640.

The previous prime is 28129993. The next prime is 28129999. The reversal of 28129995 is 59992182.

It is not a de Polignac number, because 28129995 - 2¹ = 28129993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 625111 = 28129995 / (2 + 8 + 1 + 2 + 9 + 9 + 9 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 28129995.

It is not an unprimeable number, because it can be changed into a prime (28129991) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 312511 + ... + 312600.

It is an arithmetic number, because the mean of its divisors is an integer number (4063228).

Almost surely, 2^28129995 is an apocalyptic number.

28129995 is a deficient number, since it is larger than the sum of its proper divisors (20628741).

28129995 is a wasteful number, since it uses less digits than its factorization.

28129995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625122 (or 625119 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 28129995 is about 5303.7717711078. The cubic root of 28129995 is about 304.1281020309.

It can be divided in two parts, 281 and 29995, that added together give a square (30276 = 174²).

The spelling of 28129995 in words is "twenty-eight million, one hundred twenty-nine thousand, nine hundred ninety-five".