28328634 has 12 divisors (see below), whose sum is σ = 61378746. Its totient is φ = 9442872.

The previous prime is 28328633. The next prime is 28328683. The reversal of 28328634 is 43682382.

It can be written as a sum of positive squares in only one way, i.e., 21594609 + 6734025 = 4647^2 + 2595^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28328633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 786889 + ... + 786924.

Almost surely, 2^28328634 is an apocalyptic number.

28328634 is an abundant number, since it is smaller than the sum of its proper divisors (33050112).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28328634 is a wasteful number, since it uses less digits than its factorization.

28328634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1573821 (or 1573818 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 28328634 is about 5322.4650304159. The cubic root of 28328634 is about 304.8422870009.

The spelling of 28328634 in words is "twenty-eight million, three hundred twenty-eight thousand, six hundred thirty-four".