28298986 has 4 divisors (see below), whose sum is σ = 42448482. Its totient is φ = 14149492.

The previous prime is 28298927. The next prime is 28298989. The reversal of 28298986 is 68989282.

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., 28291761 + 7225 = 5319^2 + 85^2 .

It is not an unprimeable number, because it can be changed into a prime (28298989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7074745 + ... + 7074748.

Almost surely, 2^28298986 is an apocalyptic number.

28298986 is a deficient number, since it is larger than the sum of its proper divisors (14149496).

28298986 is a wasteful number, since it uses less digits than its factorization.

28298986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14149495.

The product of its digits is 995328, while the sum is 52.

The square root of 28298986 is about 5319.6791256616. The cubic root of 28298986 is about 304.7359032512.

The spelling of 28298986 in words is "twenty-eight million, two hundred ninety-eight thousand, nine hundred eighty-six".