28072308 has 24 divisors (see below), whose sum is σ = 71457120. Its totient is φ = 8506720.

The previous prime is 28072279. The next prime is 28072309. The reversal of 28072308 is 80327082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28072309) 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 in 7 ways as a sum of consecutive naturals, for example, 106203 + ... + 106466.

It is an arithmetic number, because the mean of its divisors is an integer number (2977380).

Almost surely, 2^28072308 is an apocalyptic number.

It is an amenable number.

28072308 is an abundant number, since it is smaller than the sum of its proper divisors (43384812).

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

28072308 is a wasteful number, since it uses less digits than its factorization.

28072308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212687 (or 212685 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 28072308 is about 5298.3306805068. The cubic root of 28072308 is about 303.9200649714.

It can be divided in two parts, 2807 and 2308, that added together give a palindrome (5115).

The spelling of 28072308 in words is "twenty-eight million, seventy-two thousand, three hundred eight".