28320658 has 4 divisors (see below), whose sum is σ = 42480990. Its totient is φ = 14160328.

The previous prime is 28320647. The next prime is 28320661. The reversal of 28320658 is 85602382.

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., 20043529 + 8277129 = 4477^2 + 2877^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7080163 + ... + 7080166.

Almost surely, 2^28320658 is an apocalyptic number.

28320658 is a deficient number, since it is larger than the sum of its proper divisors (14160332).

28320658 is a wasteful number, since it uses less digits than its factorization.

28320658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14160331.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 28320658 is about 5321.7157007867. The cubic root of 28320658 is about 304.8136746046.

The spelling of 28320658 in words is "twenty-eight million, three hundred twenty thousand, six hundred fifty-eight".