138616758 has 80 divisors (see below), whose sum is σ = 357122304. Its totient is φ = 39366000.

The previous prime is 138616757. The next prime is 138616787. The reversal of 138616758 is 857616831.

138616758 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138616757) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 284391 + ... + 284877.

Almost surely, 2^138616758 is an apocalyptic number.

138616758 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 138616758, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (178561152).

138616758 is an abundant number, since it is smaller than the sum of its proper divisors (218505546).

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

138616758 is a wasteful number, since it uses less digits than its factorization.

138616758 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759 (or 750 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 138616758 is about 11773.5618229999. The cubic root of 138616758 is about 517.5336336048.

The spelling of 138616758 in words is "one hundred thirty-eight million, six hundred sixteen thousand, seven hundred fifty-eight".