28861073 has 4 divisors (see below), whose sum is σ = 29641140. Its totient is φ = 28081008.

The previous prime is 28861051. The next prime is 28861103. The reversal of 28861073 is 37016882.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21641104 + 7219969 = 4652^2 + 2687^2 .

It is a cyclic number.

It is not a de Polignac number, because 28861073 - 2⁸ = 28860817 is a prime.

It is a super-2 number, since 2×28861073² = 1665923069422658, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28861013) 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 3 ways as a sum of consecutive naturals, for example, 389978 + ... + 390051.

It is an arithmetic number, because the mean of its divisors is an integer number (7410285).

Almost surely, 2^28861073 is an apocalyptic number.

It is an amenable number.

28861073 is a deficient number, since it is larger than the sum of its proper divisors (780067).

28861073 is an equidigital number, since it uses as much as digits as its factorization.

28861073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780066.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 28861073 is about 5372.2502733957. The cubic root of 28861073 is about 306.7402904255.

The spelling of 28861073 in words is "twenty-eight million, eight hundred sixty-one thousand, seventy-three".