1217120780 has 24 divisors (see below), whose sum is σ = 2706304608. Its totient is φ = 458210048.

The previous prime is 1217120777. The next prime is 1217120803. The reversal of 1217120780 is 870217121.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1789544 + ... + 1790223.

It is an arithmetic number, because the mean of its divisors is an integer number (112762692).

Almost surely, 2^1217120780 is an apocalyptic number.

1217120780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1217120780 is an abundant number, since it is smaller than the sum of its proper divisors (1489183828).

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

1217120780 is a wasteful number, since it uses less digits than its factorization.

1217120780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3579793 (or 3579791 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 29.

The square root of 1217120780 is about 34887.2581324472. The cubic root of 1217120780 is about 1067.6884854576.

The spelling of 1217120780 in words is "one billion, two hundred seventeen million, one hundred twenty thousand, seven hundred eighty".