28161004 has 12 divisors (see below), whose sum is σ = 49347144. Its totient is φ = 14061824.

The previous prime is 28160999. The next prime is 28161017. The reversal of 28161004 is 40016182.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 949 + ... + 7564.

It is an arithmetic number, because the mean of its divisors is an integer number (4112262).

Almost surely, 2^28161004 is an apocalyptic number.

It is an amenable number.

28161004 is a deficient number, since it is larger than the sum of its proper divisors (21186140).

28161004 is a wasteful number, since it uses less digits than its factorization.

28161004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9344 (or 9342 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 28161004 is about 5306.6942629098. The cubic root of 28161004 is about 304.2398125038.

Adding to 28161004 its reverse (40016182), we get a palindrome (68177186).

The spelling of 28161004 in words is "twenty-eight million, one hundred sixty-one thousand, four".