28138607 has 8 divisors (see below), whose sum is σ = 33196032. Its totient is φ = 23340600.

The previous prime is 28138603. The next prime is 28138631. The reversal of 28138607 is 70683182.

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 28138607 - 2² = 28138603 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28138603) 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, 64619 + ... + 65052.

It is an arithmetic number, because the mean of its divisors is an integer number (4149504).

Almost surely, 2^28138607 is an apocalyptic number.

28138607 is a deficient number, since it is larger than the sum of its proper divisors (5057425).

28138607 is a wasteful number, since it uses less digits than its factorization.

28138607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129709.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 28138607 is about 5304.5835840337. The cubic root of 28138607 is about 304.1591351443.

The spelling of 28138607 in words is "twenty-eight million, one hundred thirty-eight thousand, six hundred seven".