28507198 has 8 divisors (see below), whose sum is σ = 45276192. Its totient is φ = 13415136.

The previous prime is 28507183. The next prime is 28507217. The reversal of 28507198 is 89170582.

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

It is a super-2 number, since 2×28507198² = 1625320675622408, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28507198.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 419190 + ... + 419257.

It is an arithmetic number, because the mean of its divisors is an integer number (5659524).

Almost surely, 2^28507198 is an apocalyptic number.

28507198 is a deficient number, since it is larger than the sum of its proper divisors (16768994).

28507198 is a wasteful number, since it uses less digits than its factorization.

28507198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838466.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 28507198 is about 5339.2132379219. The cubic root of 28507198 is about 305.4814504931.

The spelling of 28507198 in words is "twenty-eight million, five hundred seven thousand, one hundred ninety-eight".