1217487888792 has 72 divisors (see below), whose sum is σ = 3835708028100. Its totient is φ = 347853681504.

The previous prime is 1217487888769. The next prime is 1217487888817. The reversal of 1217487888792 is 2978887847121.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 1217487888792.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 172542942 + ... + 172549997.

Almost surely, 2^{1217487888792} is an apocalyptic number.

1217487888792 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1217487888792 is an abundant number, since it is smaller than the sum of its proper divisors (2618220139308).

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

1217487888792 is a wasteful number, since it uses less digits than its factorization.

1217487888792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345092965 (or 345092951 counting only the distinct ones).

The product of its digits is 202309632, while the sum is 72.

The spelling of 1217487888792 in words is "one trillion, two hundred seventeen billion, four hundred eighty-seven million, eight hundred eighty-eight thousand, seven hundred ninety-two".