28775957 has 8 divisors (see below), whose sum is σ = 33426432. Its totient is φ = 24260400.

The previous prime is 28775953. The next prime is 28775977. The reversal of 28775957 is 75957782.

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 28775957 - 2² = 28775953 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28775953) 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, 33269 + ... + 34122.

It is an arithmetic number, because the mean of its divisors is an integer number (4178304).

Almost surely, 2^28775957 is an apocalyptic number.

It is an amenable number.

28775957 is a deficient number, since it is larger than the sum of its proper divisors (4650475).

28775957 is an equidigital number, since it uses as much as digits as its factorization.

28775957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67459.

The product of its digits is 1234800, while the sum is 50.

The square root of 28775957 is about 5364.3226040200. The cubic root of 28775957 is about 306.4384511652.

The spelling of 28775957 in words is "twenty-eight million, seven hundred seventy-five thousand, nine hundred fifty-seven".