1247795637888 has 128 divisors (see below), whose sum is σ = 3466045255680. Its totient is φ = 396987300864.

The previous prime is 1247795637883. The next prime is 1247795637899. The reversal of 1247795637888 is 8887365977421.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×1247795637888² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1247795637883) 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, 3936645 + ... + 4241787.

It is an arithmetic number, because the mean of its divisors is an integer number (27078478560).

Almost surely, 2^{1247795637888} 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 1247795637888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1733022627840).

1247795637888 is an abundant number, since it is smaller than the sum of its proper divisors (2218249617792).

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

1247795637888 is a wasteful number, since it uses less digits than its factorization.

1247795637888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305646 (or 305634 counting only the distinct ones).

The product of its digits is 1137991680, while the sum is 75.

The spelling of 1247795637888 in words is "one trillion, two hundred forty-seven billion, seven hundred ninety-five million, six hundred thirty-seven thousand, eight hundred eighty-eight".