28702116 has 18 divisors (see below), whose sum is σ = 72552662. Its totient is φ = 9567360.

The previous prime is 28702087. The next prime is 28702117. The reversal of 28702116 is 61120782.

It can be written as a sum of positive squares in only one way, i.e., 25462116 + 3240000 = 5046^2 + 1800^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×28702116² = 1647622925754912, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28702116.

It is not an unprimeable number, because it can be changed into a prime (28702117) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 398605 + ... + 398676.

Almost surely, 2^28702116 is an apocalyptic number.

It is an amenable number.

28702116 is an abundant number, since it is smaller than the sum of its proper divisors (43850546).

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

28702116 is a wasteful number, since it uses less digits than its factorization.

28702116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797291 (or 797286 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 28702116 is about 5357.4355805740. The cubic root of 28702116 is about 306.1761128984.

Adding to 28702116 its reverse (61120782), we get a palindrome (89822898).

The spelling of 28702116 in words is "twenty-eight million, seven hundred two thousand, one hundred sixteen".