138648776 has 64 divisors (see below), whose sum is σ = 314496000. Its totient is φ = 55978560.

The previous prime is 138648767. The next prime is 138648779. The reversal of 138648776 is 677846831.

It is not an unprimeable number, because it can be changed into a prime (138648779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 330695 + ... + 331113.

It is an arithmetic number, because the mean of its divisors is an integer number (4914000).

Almost surely, 2^138648776 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138648776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157248000).

138648776 is an abundant number, since it is smaller than the sum of its proper divisors (175847224).

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

138648776 is a wasteful number, since it uses less digits than its factorization.

138648776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 762 (or 758 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 50.

The square root of 138648776 is about 11774.9214859378. The cubic root of 138648776 is about 517.5734775517.

The spelling of 138648776 in words is "one hundred thirty-eight million, six hundred forty-eight thousand, seven hundred seventy-six".