28747812 has 12 divisors (see below), whose sum is σ = 67078256. Its totient is φ = 9582600.

The previous prime is 28747781. The next prime is 28747813. The reversal of 28747812 is 21874782.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (28747813) 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 3 ways as a sum of consecutive naturals, for example, 1197814 + ... + 1197837.

Almost surely, 2^28747812 is an apocalyptic number.

It is an amenable number.

28747812 is an abundant number, since it is smaller than the sum of its proper divisors (38330444).

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

28747812 is a wasteful number, since it uses less digits than its factorization.

28747812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2395658 (or 2395656 counting only the distinct ones).

The product of its digits is 50176, while the sum is 39.

The square root of 28747812 is about 5361.6986114477. The cubic root of 28747812 is about 306.3385121362.

The spelling of 28747812 in words is "twenty-eight million, seven hundred forty-seven thousand, eight hundred twelve".