28861445 has 4 divisors (see below), whose sum is σ = 34633740. Its totient is φ = 23089152.

The previous prime is 28861439. The next prime is 28861447. The reversal of 28861445 is 54416882.

It is a happy number.

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 20784481 + 8076964 = 4559^2 + 2842^2 .

It is a cyclic number.

It is not a de Polignac number, because 28861445 - 2⁶ = 28861381 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28861399 and 28861408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28861447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2886140 + ... + 2886149.

It is an arithmetic number, because the mean of its divisors is an integer number (8658435).

Almost surely, 2^28861445 is an apocalyptic number.

It is an amenable number.

28861445 is a deficient number, since it is larger than the sum of its proper divisors (5772295).

28861445 is an equidigital number, since it uses as much as digits as its factorization.

28861445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5772294.

The product of its digits is 61440, while the sum is 38.

The square root of 28861445 is about 5372.2848956473. The cubic root of 28861445 is about 306.7416083125.

The spelling of 28861445 in words is "twenty-eight million, eight hundred sixty-one thousand, four hundred forty-five".