28957385 has 8 divisors (see below), whose sum is σ = 34783560. Its totient is φ = 23142784.

The previous prime is 28957373. The next prime is 28957403. The reversal of 28957385 is 58375982.

It can be written as a sum of positive squares in 4 ways, for example, as 16418704 + 12538681 = 4052^2 + 3541^2 .

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 28957385 - 2¹² = 28953289 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4199 + ... + 8691.

It is an arithmetic number, because the mean of its divisors is an integer number (4347945).

Almost surely, 2^28957385 is an apocalyptic number.

It is an amenable number.

28957385 is a deficient number, since it is larger than the sum of its proper divisors (5826175).

28957385 is a wasteful number, since it uses less digits than its factorization.

28957385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5787.

The product of its digits is 604800, while the sum is 47.

The square root of 28957385 is about 5381.2066490704. The cubic root of 28957385 is about 307.0811182404.

The spelling of 28957385 in words is "twenty-eight million, nine hundred fifty-seven thousand, three hundred eighty-five".