1388862082640 has 80 divisors (see below), whose sum is σ = 3237268374480. Its totient is φ = 554141122560.

The previous prime is 1388862082633. The next prime is 1388862082649. The reversal of 1388862082640 is 462802688831.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 37111710736 + 1351750371904 = 192644^2 + 1162648^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388862082649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166745996 + ... + 166754324.

It is an arithmetic number, because the mean of its divisors is an integer number (40465854681).

Almost surely, 2^{1388862082640} is an apocalyptic number.

1388862082640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1388862082640 is an abundant number, since it is smaller than the sum of its proper divisors (1848406291840).

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

1388862082640 is a wasteful number, since it uses less digits than its factorization.

1388862082640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13360 (or 13354 counting only the distinct ones).

The product of its (nonzero) digits is 7077888, while the sum is 56.

The spelling of 1388862082640 in words is "one trillion, three hundred eighty-eight billion, eight hundred sixty-two million, eighty-two thousand, six hundred forty".