28520098 has 4 divisors (see below), whose sum is σ = 42780150. Its totient is φ = 14260048.

The previous prime is 28520059. The next prime is 28520099. The reversal of 28520098 is 89002582.

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

It can be written as a sum of positive squares in only one way, i.e., 18003049 + 10517049 = 4243^2 + 3243^2 .

It is not an unprimeable number, because it can be changed into a prime (28520099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7130023 + ... + 7130026.

Almost surely, 2^28520098 is an apocalyptic number.

28520098 is a deficient number, since it is larger than the sum of its proper divisors (14260052).

28520098 is a wasteful number, since it uses less digits than its factorization.

28520098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14260051.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 28520098 is about 5340.4211444417. The cubic root of 28520098 is about 305.5275220905.

The spelling of 28520098 in words is "twenty-eight million, five hundred twenty thousand, ninety-eight".