138768288 has 24 divisors (see below), whose sum is σ = 364267008. Its totient is φ = 46256064.

The previous prime is 138768283. The next prime is 138768337. The reversal of 138768288 is 882867831.

It is a tau number, because it is divible by the number of its divisors (24).

It is a self number, because there is not a number n which added to its sum of digits gives 138768288.

It is not an unprimeable number, because it can be changed into a prime (138768283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 722656 + ... + 722847.

It is an arithmetic number, because the mean of its divisors is an integer number (15177792).

Almost surely, 2^138768288 is an apocalyptic number.

It is an amenable number.

138768288 is an abundant number, since it is smaller than the sum of its proper divisors (225498720).

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

138768288 is a wasteful number, since it uses less digits than its factorization.

138768288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1445516 (or 1445508 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 51.

The square root of 138768288 is about 11779.9952461790. The cubic root of 138768288 is about 517.7221469182.

The spelling of 138768288 in words is "one hundred thirty-eight million, seven hundred sixty-eight thousand, two hundred eighty-eight".