28774161 has 24 divisors (see below), whose sum is σ = 44955456. Its totient is φ = 17629920.

The previous prime is 28774157. The next prime is 28774201. The reversal of 28774161 is 16147782.

It is not a de Polignac number, because 28774161 - 2² = 28774157 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28774111) by changing a digit.

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 in 23 ways as a sum of consecutive naturals, for example, 38356 + ... + 39098.

It is an arithmetic number, because the mean of its divisors is an integer number (1873144).

Almost surely, 2^28774161 is an apocalyptic number.

It is an amenable number.

28774161 is a deficient number, since it is larger than the sum of its proper divisors (16181295).

28774161 is a wasteful number, since it uses less digits than its factorization.

28774161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1093 (or 1090 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 28774161 is about 5364.1551990971. The cubic root of 28774161 is about 306.4320757629.

The spelling of 28774161 in words is "twenty-eight million, seven hundred seventy-four thousand, one hundred sixty-one".