28861442 has 4 divisors (see below), whose sum is σ = 43292166. Its totient is φ = 14430720.

The previous prime is 28861439. The next prime is 28861447. The reversal of 28861442 is 24416882.

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

It can be written as a sum of positive squares in only one way, i.e., 27994681 + 866761 = 5291^2 + 931^2 .

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 as a sum of consecutive naturals, namely, 7215359 + ... + 7215362.

Almost surely, 2^28861442 is an apocalyptic number.

28861442 is a deficient number, since it is larger than the sum of its proper divisors (14430724).

28861442 is a wasteful number, since it uses less digits than its factorization.

28861442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14430723.

The product of its digits is 24576, while the sum is 35.

The square root of 28861442 is about 5372.2846164365. The cubic root of 28861442 is about 306.7415976844.

The spelling of 28861442 in words is "twenty-eight million, eight hundred sixty-one thousand, four hundred forty-two".