28791429 has 4 divisors (see below), whose sum is σ = 38388576. Its totient is φ = 19194284.

The previous prime is 28791409. The next prime is 28791431. The reversal of 28791429 is 92419782.

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 28791429 - 2⁵ = 28791397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28791409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4798569 + ... + 4798574.

It is an arithmetic number, because the mean of its divisors is an integer number (9597144).

Almost surely, 2^28791429 is an apocalyptic number.

It is an amenable number.

28791429 is a deficient number, since it is larger than the sum of its proper divisors (9597147).

28791429 is an equidigital number, since it uses as much as digits as its factorization.

28791429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9597146.

The product of its digits is 72576, while the sum is 42.

The square root of 28791429 is about 5365.7645308008. The cubic root of 28791429 is about 306.4933623564.

The spelling of 28791429 in words is "twenty-eight million, seven hundred ninety-one thousand, four hundred twenty-nine".