138628065 has 8 divisors (see below), whose sum is σ = 221804928. Its totient is φ = 73934960.

The previous prime is 138628031. The next prime is 138628069. The reversal of 138628065 is 560826831.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-138628065 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138628069) 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, 4620921 + ... + 4620950.

It is an arithmetic number, because the mean of its divisors is an integer number (27725616).

Almost surely, 2^138628065 is an apocalyptic number.

138628065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138628065 is a deficient number, since it is larger than the sum of its proper divisors (83176863).

138628065 is an equidigital number, since it uses as much as digits as its factorization.

138628065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9241879.

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 138628065 is about 11774.0419992456. The cubic root of 138628065 is about 517.5477050004.

The spelling of 138628065 in words is "one hundred thirty-eight million, six hundred twenty-eight thousand, sixty-five".