28157198 has 8 divisors (see below), whose sum is σ = 44072208. Its totient is φ = 13466464.

The previous prime is 28157191. The next prime is 28157249. The reversal of 28157198 is 89175182.

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

It is a super-2 number, since 2×28157198² = 1585655598422408, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28157191) 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 3 ways as a sum of consecutive naturals, for example, 306011 + ... + 306102.

It is an arithmetic number, because the mean of its divisors is an integer number (5509026).

Almost surely, 2^28157198 is an apocalyptic number.

28157198 is a deficient number, since it is larger than the sum of its proper divisors (15915010).

28157198 is a wasteful number, since it uses less digits than its factorization.

28157198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612138.

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

The square root of 28157198 is about 5306.3356471298. The cubic root of 28157198 is about 304.2261057376.

The spelling of 28157198 in words is "twenty-eight million, one hundred fifty-seven thousand, one hundred ninety-eight".