28201616 has 10 divisors (see below), whose sum is σ = 54640662. Its totient is φ = 14100800.

The previous prime is 28201609. The next prime is 28201637. The reversal of 28201616 is 61610282.

It can be written as a sum of positive squares in only one way, i.e., 16777216 + 11424400 = 4096^2 + 3380^2 .

It is a super-3 number, since 3×28201616³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 881285 + ... + 881316.

Almost surely, 2^28201616 is an apocalyptic number.

It is an amenable number.

28201616 is a deficient number, since it is larger than the sum of its proper divisors (26439046).

28201616 is a wasteful number, since it uses less digits than its factorization.

28201616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1762609 (or 1762603 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 28201616 is about 5310.5193719635. The cubic root of 28201616 is about 304.3859939923.

Adding to 28201616 its reverse (61610282), we get a palindrome (89811898).

The spelling of 28201616 in words is "twenty-eight million, two hundred one thousand, six hundred sixteen".