28747836 has 144 divisors (see below), whose sum is σ = 85307040. Its totient is φ = 8087040.

The previous prime is 28747813. The next prime is 28747837. The reversal of 28747836 is 63874782.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28747791 and 28747800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28747837) 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 47 ways as a sum of consecutive naturals, for example, 471246 + ... + 471306.

It is an arithmetic number, because the mean of its divisors is an integer number (592410).

It is a vampire number, since it can be written as 3477 ⋅ 8268 (with its own digits).

Almost surely, 2^28747836 is an apocalyptic number.

28747836 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28747836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42653520).

28747836 is an abundant number, since it is smaller than the sum of its proper divisors (56559204).

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

28747836 is a wasteful number, since it uses less digits than its factorization.

28747836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156 (or 151 counting only the distinct ones).

The product of its digits is 451584, while the sum is 45.

The square root of 28747836 is about 5361.7008495439. The cubic root of 28747836 is about 306.3385973847.

The spelling of 28747836 in words is "twenty-eight million, seven hundred forty-seven thousand, eight hundred thirty-six".