28729444 has 12 divisors (see below), whose sum is σ = 52922800. Its totient is φ = 13608648.

The previous prime is 28729433. The next prime is 28729447. The reversal of 28729444 is 44492782.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 28729397 and 28729406.

It is not an unprimeable number, because it can be changed into a prime (28729447) 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, 188934 + ... + 189085.

Almost surely, 2^28729444 is an apocalyptic number.

It is an amenable number.

28729444 is a deficient number, since it is larger than the sum of its proper divisors (24193356).

28729444 is a wasteful number, since it uses less digits than its factorization.

28729444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378042 (or 378040 counting only the distinct ones).

The product of its digits is 129024, while the sum is 40.

The square root of 28729444 is about 5359.9854477414. The cubic root of 28729444 is about 306.2732547106.

The spelling of 28729444 in words is "twenty-eight million, seven hundred twenty-nine thousand, four hundred forty-four".