28308436 has 24 divisors (see below), whose sum is σ = 54260640. Its totient is φ = 12842592.

The previous prime is 28308419. The next prime is 28308443. The reversal of 28308436 is 63480382.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 1546 + ... + 7681.

It is an arithmetic number, because the mean of its divisors is an integer number (2260860).

Almost surely, 2^28308436 is an apocalyptic number.

28308436 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28308436 is a deficient number, since it is larger than the sum of its proper divisors (25952204).

28308436 is a wasteful number, since it uses less digits than its factorization.

28308436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9303 (or 9301 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 28308436 is about 5320.5672629899. The cubic root of 28308436 is about 304.7698200589.

The spelling of 28308436 in words is "twenty-eight million, three hundred eight thousand, four hundred thirty-six".