28051716 has 72 divisors (see below), whose sum is σ = 83081376. Its totient is φ = 7284480.

The previous prime is 28051711. The next prime is 28051739. The reversal of 28051716 is 61715082.

It is not an unprimeable number, because it can be changed into a prime (28051711) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4300 + ... + 8636.

It is an arithmetic number, because the mean of its divisors is an integer number (1153908).

Almost surely, 2^28051716 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 28051716, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41540688).

28051716 is an abundant number, since it is smaller than the sum of its proper divisors (55029660).

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

28051716 is a wasteful number, since it uses less digits than its factorization.

28051716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4369 (or 4360 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 28051716 is about 5296.3870704472. The cubic root of 28051716 is about 303.8457348660.

Adding to 28051716 its reverse (61715082), we get a palindrome (89766798).

The spelling of 28051716 in words is "twenty-eight million, fifty-one thousand, seven hundred sixteen".