28071912 has 64 divisors (see below), whose sum is σ = 77319360. Its totient is φ = 8422400.

The previous prime is 28071907. The next prime is 28071919. The reversal of 28071912 is 21917082.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 28071912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28071919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29362 + ... + 30302.

It is an arithmetic number, because the mean of its divisors is an integer number (1208115).

Almost surely, 2^28071912 is an apocalyptic number.

28071912 is a gapful number since it is divisible by the number (22) 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 28071912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38659680).

28071912 is an abundant number, since it is smaller than the sum of its proper divisors (49247448).

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

28071912 is a wasteful number, since it uses less digits than its factorization.

28071912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1074 (or 1070 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 28071912 is about 5298.2933101141. The cubic root of 28071912 is about 303.9186358891.

Adding to 28071912 its reverse (21917082), we get a palindrome (49988994).

The spelling of 28071912 in words is "twenty-eight million, seventy-one thousand, nine hundred twelve".