28618139 has 8 divisors (see below), whose sum is σ = 31301040. Its totient is φ = 25948800.

The previous prime is 28618133. The next prime is 28618147. The reversal of 28618139 is 93181682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28618139 - 2¹⁶ = 28552603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28618133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1319 + ... + 7679.

It is an arithmetic number, because the mean of its divisors is an integer number (3912630).

Almost surely, 2^28618139 is an apocalyptic number.

28618139 is a deficient number, since it is larger than the sum of its proper divisors (2682901).

28618139 is a wasteful number, since it uses less digits than its factorization.

28618139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6781.

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

The square root of 28618139 is about 5349.5924143807. The cubic root of 28618139 is about 305.8772166058.

The spelling of 28618139 in words is "twenty-eight million, six hundred eighteen thousand, one hundred thirty-nine".