28171016 has 8 divisors (see below), whose sum is σ = 52820670. Its totient is φ = 14085504.

The previous prime is 28171009. The next prime is 28171043. The reversal of 28171016 is 61017182.

It can be written as a sum of positive squares in only one way, i.e., 16240900 + 11930116 = 4030^2 + 3454^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×28171016² = 1587212284944512, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1760681 + ... + 1760696.

Almost surely, 2^28171016 is an apocalyptic number.

It is an amenable number.

28171016 is a deficient number, since it is larger than the sum of its proper divisors (24649654).

28171016 is a wasteful number, since it uses less digits than its factorization.

28171016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3521383 (or 3521379 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 28171016 is about 5307.6375158822. The cubic root of 28171016 is about 304.2758633976.

Adding to 28171016 its reverse (61017182), we get a palindrome (89188198).

The spelling of 28171016 in words is "twenty-eight million, one hundred seventy-one thousand, sixteen".