28650161 has 4 divisors (see below), whose sum is σ = 28743792. Its totient is φ = 28556532.

The previous prime is 28650137. The next prime is 28650199. The reversal of 28650161 is 16105682.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16105682 = 2 ⋅8052841.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28650161 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28650101) 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 3 ways as a sum of consecutive naturals, for example, 46355 + ... + 46968.

It is an arithmetic number, because the mean of its divisors is an integer number (7185948).

Almost surely, 2^28650161 is an apocalyptic number.

It is an amenable number.

28650161 is a deficient number, since it is larger than the sum of its proper divisors (93631).

28650161 is an equidigital number, since it uses as much as digits as its factorization.

28650161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93630.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 28650161 is about 5352.5845159138. The cubic root of 28650161 is about 305.9912602342.

It can be divided in two parts, 286 and 50161, that multiplied together give a triangular number (14346046 = T₅₃₅₆).

The spelling of 28650161 in words is "twenty-eight million, six hundred fifty thousand, one hundred sixty-one".