28329641 has 4 divisors (see below), whose sum is σ = 28594512. Its totient is φ = 28064772.

The previous prime is 28329557. The next prime is 28329649. The reversal of 28329641 is 14692382.

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, and also an emirpimes, since its reverse is a distinct semiprime: 14692382 = 2 ⋅7346191.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28329641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28329649) 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, 132275 + ... + 132488.

It is an arithmetic number, because the mean of its divisors is an integer number (7148628).

Almost surely, 2^28329641 is an apocalyptic number.

It is an amenable number.

28329641 is a deficient number, since it is larger than the sum of its proper divisors (264871).

28329641 is a wasteful number, since it uses less digits than its factorization.

28329641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264870.

The product of its digits is 20736, while the sum is 35.

The square root of 28329641 is about 5322.5596285998. The cubic root of 28329641 is about 304.8458990417.

The spelling of 28329641 in words is "twenty-eight million, three hundred twenty-nine thousand, six hundred forty-one".