28806949 has 4 divisors (see below), whose sum is σ = 28824160. Its totient is φ = 28789740.

The previous prime is 28806929. The next prime is 28806989. The reversal of 28806949 is 94960882.

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 28806949 - 2⁷ = 28806821 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28806899 and 28806908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28806919) 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, 5787 + ... + 9544.

It is an arithmetic number, because the mean of its divisors is an integer number (7206040).

Almost surely, 2^28806949 is an apocalyptic number.

It is an amenable number.

28806949 is a deficient number, since it is larger than the sum of its proper divisors (17211).

28806949 is a wasteful number, since it uses less digits than its factorization.

28806949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17210.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 28806949 is about 5367.2105417992. The cubic root of 28806949 is about 306.5484241427.

The spelling of 28806949 in words is "twenty-eight million, eight hundred six thousand, nine hundred forty-nine".