28429691 has 2 divisors, whose sum is σ = 28429692. Its totient is φ = 28429690.

The previous prime is 28429673. The next prime is 28429693. The reversal of 28429691 is 19692482.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28429691 is a prime.

Together with 28429693, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28429693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14214845 + 14214846.

It is an arithmetic number, because the mean of its divisors is an integer number (14214846).

Almost surely, 2^28429691 is an apocalyptic number.

28429691 is a deficient number, since it is larger than the sum of its proper divisors (1).

28429691 is an equidigital number, since it uses as much as digits as its factorization.

28429691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 41.

The square root of 28429691 is about 5331.9500185204. The cubic root of 28429691 is about 305.2043457266.

The spelling of 28429691 in words is "twenty-eight million, four hundred twenty-nine thousand, six hundred ninety-one".