28831442 has 4 divisors (see below), whose sum is σ = 43247166. Its totient is φ = 14415720.

The previous prime is 28831433. The next prime is 28831469. The reversal of 28831442 is 24413882.

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., 19351201 + 9480241 = 4399^2 + 3079^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28831399 and 28831408.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7207859 + ... + 7207862.

Almost surely, 2^28831442 is an apocalyptic number.

28831442 is a deficient number, since it is larger than the sum of its proper divisors (14415724).

28831442 is a wasteful number, since it uses less digits than its factorization.

28831442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14415723.

The product of its digits is 12288, while the sum is 32.

The square root of 28831442 is about 5369.4917822826. The cubic root of 28831442 is about 306.6352800791.

It can be divided in two parts, 2883 and 1442, that multiplied together give a triangular number (4157286 = T₂₈₈₃).

The spelling of 28831442 in words is "twenty-eight million, eight hundred thirty-one thousand, four hundred forty-two".