28969651 has 4 divisors (see below), whose sum is σ = 29052072. Its totient is φ = 28887232.

The previous prime is 28969643. The next prime is 28969663. The reversal of 28969651 is 15696982.

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

It is a cyclic number.

It is not a de Polignac number, because 28969651 - 2³ = 28969643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28969621) 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, 40681 + ... + 41386.

It is an arithmetic number, because the mean of its divisors is an integer number (7263018).

Almost surely, 2^28969651 is an apocalyptic number.

28969651 is a deficient number, since it is larger than the sum of its proper divisors (82421).

28969651 is an equidigital number, since it uses as much as digits as its factorization.

28969651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82420.

The product of its digits is 233280, while the sum is 46.

The square root of 28969651 is about 5382.3462356114. The cubic root of 28969651 is about 307.1244707426.

The spelling of 28969651 in words is "twenty-eight million, nine hundred sixty-nine thousand, six hundred fifty-one".