28199858 has 4 divisors (see below), whose sum is σ = 42299790. Its totient is φ = 14099928.

The previous prime is 28199837. The next prime is 28199879. The reversal of 28199858 is 85899182.

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

It is an interprime number because it is at equal distance from previous prime (28199837) and next prime (28199879).

It can be written as a sum of positive squares in only one way, i.e., 26491609 + 1708249 = 5147^2 + 1307^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7049963 + ... + 7049966.

Almost surely, 2^28199858 is an apocalyptic number.

28199858 is a deficient number, since it is larger than the sum of its proper divisors (14099932).

28199858 is a wasteful number, since it uses less digits than its factorization.

28199858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14099931.

The product of its digits is 414720, while the sum is 50.

The square root of 28199858 is about 5310.3538488504. The cubic root of 28199858 is about 304.3796690392.

The spelling of 28199858 in words is "twenty-eight million, one hundred ninety-nine thousand, eight hundred fifty-eight".