28256629 has 4 divisors (see below), whose sum is σ = 29743840. Its totient is φ = 26769420.

The previous prime is 28256623. The next prime is 28256653. The reversal of 28256629 is 92665282.

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 28256629 - 2¹¹ = 28254581 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28256591 and 28256600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28256623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 743577 + ... + 743614.

It is an arithmetic number, because the mean of its divisors is an integer number (7435960).

Almost surely, 2^28256629 is an apocalyptic number.

It is an amenable number.

28256629 is a deficient number, since it is larger than the sum of its proper divisors (1487211).

28256629 is a wasteful number, since it uses less digits than its factorization.

28256629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1487210.

The product of its digits is 103680, while the sum is 40.

The square root of 28256629 is about 5315.6964736523. The cubic root of 28256629 is about 304.5837877425.

The spelling of 28256629 in words is "twenty-eight million, two hundred fifty-six thousand, six hundred twenty-nine".