28129467 has 4 divisors (see below), whose sum is σ = 37505960. Its totient is φ = 18752976.

The previous prime is 28129459. The next prime is 28129469. The reversal of 28129467 is 76492182.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28129467 - 2³ = 28129459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28129469) 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, 4688242 + ... + 4688247.

It is an arithmetic number, because the mean of its divisors is an integer number (9376490).

Almost surely, 2^28129467 is an apocalyptic number.

28129467 is a deficient number, since it is larger than the sum of its proper divisors (9376493).

28129467 is an equidigital number, since it uses as much as digits as its factorization.

28129467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9376492.

The product of its digits is 48384, while the sum is 39.

The square root of 28129467 is about 5303.7219949767. The cubic root of 28129467 is about 304.1261991908.

The spelling of 28129467 in words is "twenty-eight million, one hundred twenty-nine thousand, four hundred sixty-seven".