28918161 has 32 divisors (see below), whose sum is σ = 44432640. Its totient is φ = 18576000.

The previous prime is 28918159. The next prime is 28918163. The reversal of 28918161 is 16181982.

It is an interprime number because it is at equal distance from previous prime (28918159) and next prime (28918163).

It is not a de Polignac number, because 28918161 - 2¹ = 28918159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28918163) by changing a digit.

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 in 31 ways as a sum of consecutive naturals, for example, 167071 + ... + 167243.

It is an arithmetic number, because the mean of its divisors is an integer number (1388520).

Almost surely, 2^28918161 is an apocalyptic number.

It is an amenable number.

28918161 is a deficient number, since it is larger than the sum of its proper divisors (15514479).

28918161 is a wasteful number, since it uses less digits than its factorization.

28918161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374 (or 368 counting only the distinct ones).

The product of its digits is 6912, while the sum is 36.

The square root of 28918161 is about 5377.5608783165. The cubic root of 28918161 is about 306.9424041457.

The spelling of 28918161 in words is "twenty-eight million, nine hundred eighteen thousand, one hundred sixty-one".