28117798 has 4 divisors (see below), whose sum is σ = 42176700. Its totient is φ = 14058898.

The previous prime is 28117783. The next prime is 28117801. The reversal of 28117798 is 89771182.

It is a happy number.

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

It is a super-2 number, since 2×28117798² = 1581221128737608, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7029448 + ... + 7029451.

It is an arithmetic number, because the mean of its divisors is an integer number (10544175).

Almost surely, 2^28117798 is an apocalyptic number.

28117798 is a deficient number, since it is larger than the sum of its proper divisors (14058902).

28117798 is a wasteful number, since it uses less digits than its factorization.

28117798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14058901.

The product of its digits is 56448, while the sum is 43.

The square root of 28117798 is about 5302.6218043530. The cubic root of 28117798 is about 304.0841396256.

It can be divided in two parts, 2811 and 7798, that added together give a square (10609 = 103²).

The spelling of 28117798 in words is "twenty-eight million, one hundred seventeen thousand, seven hundred ninety-eight".