28357198 has 4 divisors (see below), whose sum is σ = 42535800. Its totient is φ = 14178598.

The previous prime is 28357193. The next prime is 28357201. The reversal of 28357198 is 89175382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89175382 = 2 ⋅44587691.

It is a super-2 number, since 2×28357198² = 1608261356822408, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28357193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7089298 + ... + 7089301.

It is an arithmetic number, because the mean of its divisors is an integer number (10633950).

Almost surely, 2^28357198 is an apocalyptic number.

28357198 is a deficient number, since it is larger than the sum of its proper divisors (14178602).

28357198 is a wasteful number, since it uses less digits than its factorization.

28357198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14178601.

The product of its digits is 120960, while the sum is 43.

The square root of 28357198 is about 5325.1476974822. The cubic root of 28357198 is about 304.9447109312.

The spelling of 28357198 in words is "twenty-eight million, three hundred fifty-seven thousand, one hundred ninety-eight".