28009157 has 8 divisors (see below), whose sum is σ = 31609440. Its totient is φ = 24584560.

The previous prime is 28009153. The next prime is 28009171. The reversal of 28009157 is 75190082.

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

It is not a de Polignac number, because 28009157 - 2² = 28009153 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 (28009153) 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, 43583 + ... + 44220.

It is an arithmetic number, because the mean of its divisors is an integer number (3951180).

Almost surely, 2^28009157 is an apocalyptic number.

It is an amenable number.

28009157 is a deficient number, since it is larger than the sum of its proper divisors (3600283).

28009157 is a wasteful number, since it uses less digits than its factorization.

28009157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87843.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 28009157 is about 5292.3678065682. The cubic root of 28009157 is about 303.6919960144.

The spelling of 28009157 in words is "twenty-eight million, nine thousand, one hundred fifty-seven".