28917158 has 4 divisors (see below), whose sum is σ = 43375740. Its totient is φ = 14458578.

The previous prime is 28917151. The next prime is 28917179. The reversal of 28917158 is 85171982.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28917151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7229288 + ... + 7229291.

It is an arithmetic number, because the mean of its divisors is an integer number (10843935).

Almost surely, 2^28917158 is an apocalyptic number.

28917158 is a deficient number, since it is larger than the sum of its proper divisors (14458582).

28917158 is a wasteful number, since it uses less digits than its factorization.

28917158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14458581.

The product of its digits is 40320, while the sum is 41.

The square root of 28917158 is about 5377.4676196143. The cubic root of 28917158 is about 306.9388554323.

The spelling of 28917158 in words is "twenty-eight million, nine hundred seventeen thousand, one hundred fifty-eight".