28155598 has 4 divisors (see below), whose sum is σ = 42233400. Its totient is φ = 14077798.

The previous prime is 28155593. The next prime is 28155599. The reversal of 28155598 is 89555182.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28155593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7038898 + ... + 7038901.

It is an arithmetic number, because the mean of its divisors is an integer number (10558350).

Almost surely, 2^28155598 is an apocalyptic number.

28155598 is a deficient number, since it is larger than the sum of its proper divisors (14077802).

28155598 is a wasteful number, since it uses less digits than its factorization.

28155598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14077801.

The product of its digits is 144000, while the sum is 43.

The square root of 28155598 is about 5306.1848818148. The cubic root of 28155598 is about 304.2203431970.

The spelling of 28155598 in words is "twenty-eight million, one hundred fifty-five thousand, five hundred ninety-eight".