28205957 has 8 divisors (see below), whose sum is σ = 30804480. Its totient is φ = 25668720.

The previous prime is 28205921. The next prime is 28205963. The reversal of 28205957 is 75950282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28205957 - 2¹⁰ = 28204933 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28205957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28205977) 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 7 ways as a sum of consecutive naturals, for example, 14357 + ... + 16202.

It is an arithmetic number, because the mean of its divisors is an integer number (3850560).

Almost surely, 2^28205957 is an apocalyptic number.

It is an amenable number.

28205957 is a deficient number, since it is larger than the sum of its proper divisors (2598523).

28205957 is a wasteful number, since it uses less digits than its factorization.

28205957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30643.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 28205957 is about 5310.9280733220. The cubic root of 28205957 is about 304.4016109674.

The spelling of 28205957 in words is "twenty-eight million, two hundred five thousand, nine hundred fifty-seven".