138800064 has 56 divisors (see below), whose sum is σ = 395498320. Its totient is φ = 42706944.

The previous prime is 138800063. The next prime is 138800069. The reversal of 138800064 is 460008831.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138800063) 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, 25309 + ... + 30300.

It is an arithmetic number, because the mean of its divisors is an integer number (7062470).

Almost surely, 2^138800064 is an apocalyptic number.

It is an amenable number.

138800064 is an abundant number, since it is smaller than the sum of its proper divisors (256698256).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138800064 is a wasteful number, since it uses less digits than its factorization.

138800064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55637 (or 55627 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 138800064 is about 11781.3438961775. The cubic root of 138800064 is about 517.7616609494.

Adding to 138800064 its reverse (460008831), we get a palindrome (598808895).

The spelling of 138800064 in words is "one hundred thirty-eight million, eight hundred thousand, sixty-four".