28656429 has 4 divisors (see below), whose sum is σ = 38208576. Its totient is φ = 19104284.

The previous prime is 28656409. The next prime is 28656451. The reversal of 28656429 is 92465682.

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 28656429 - 2¹³ = 28648237 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28656409) 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, 4776069 + ... + 4776074.

It is an arithmetic number, because the mean of its divisors is an integer number (9552144).

Almost surely, 2^28656429 is an apocalyptic number.

It is an amenable number.

28656429 is a deficient number, since it is larger than the sum of its proper divisors (9552147).

28656429 is an equidigital number, since it uses as much as digits as its factorization.

28656429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9552146.

The product of its digits is 207360, while the sum is 42.

The square root of 28656429 is about 5353.1699954326. The cubic root of 28656429 is about 306.0135732370.

The spelling of 28656429 in words is "twenty-eight million, six hundred fifty-six thousand, four hundred twenty-nine".