28639118 has 32 divisors (see below), whose sum is σ = 49040640. Its totient is φ = 12458880.

The previous prime is 28639111. The next prime is 28639123. The reversal of 28639118 is 81193682.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28639111) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 27263 + ... + 28293.

It is an arithmetic number, because the mean of its divisors is an integer number (1532520).

Almost surely, 2^28639118 is an apocalyptic number.

28639118 is a deficient number, since it is larger than the sum of its proper divisors (20401522).

28639118 is a wasteful number, since it uses less digits than its factorization.

28639118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112.

The product of its digits is 20736, while the sum is 38.

The square root of 28639118 is about 5351.5528587504. The cubic root of 28639118 is about 305.9519411332.

The spelling of 28639118 in words is "twenty-eight million, six hundred thirty-nine thousand, one hundred eighteen".