28644038 has 4 divisors (see below), whose sum is σ = 42966060. Its totient is φ = 14322018.

The previous prime is 28644037. The next prime is 28644053. The reversal of 28644038 is 83044682.

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

It is a junction number, because it is equal to n+sod(n) for n = 28643989 and 28644007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28644037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7161008 + ... + 7161011.

It is an arithmetic number, because the mean of its divisors is an integer number (10741515).

Almost surely, 2^28644038 is an apocalyptic number.

28644038 is a deficient number, since it is larger than the sum of its proper divisors (14322022).

28644038 is a wasteful number, since it uses less digits than its factorization.

28644038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14322021.

The product of its (nonzero) digits is 36864, while the sum is 35.

The square root of 28644038 is about 5352.0125186700. The cubic root of 28644038 is about 305.9694602640.

The spelling of 28644038 in words is "twenty-eight million, six hundred forty-four thousand, thirty-eight".