28071012 has 48 divisors (see below), whose sum is σ = 71245440. Its totient is φ = 8566272.

The previous prime is 28071011. The next prime is 28071013. The reversal of 28071012 is 21017082.

It is an interprime number because it is at equal distance from previous prime (28071011) and next prime (28071013).

It is a self number, because there is not a number n which added to its sum of digits gives 28071012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28071011) 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 15 ways as a sum of consecutive naturals, for example, 5689 + ... + 9407.

It is an arithmetic number, because the mean of its divisors is an integer number (1484280).

Almost surely, 2^28071012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28071012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35622720).

28071012 is an abundant number, since it is smaller than the sum of its proper divisors (43174428).

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

28071012 is a wasteful number, since it uses less digits than its factorization.

28071012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3780 (or 3778 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 28071012 is about 5298.2083764231. The cubic root of 28071012 is about 303.9153879249.

Adding to 28071012 its reverse (21017082), we get a palindrome (49088094).

The spelling of 28071012 in words is "twenty-eight million, seventy-one thousand, twelve".