981780007218 has 32 divisors (see below), whose sum is σ = 1966129670400. Its totient is φ = 326831936256.

The previous prime is 981780007217. The next prime is 981780007301. The reversal of 981780007218 is 812700087189.

It is a super-2 number, since 2×981780007218² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (981780007217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20396103 + ... + 20444181.

It is an arithmetic number, because the mean of its divisors is an integer number (61441552200).

Almost surely, 2^981780007218 is an apocalyptic number.

981780007218 is an abundant number, since it is smaller than the sum of its proper divisors (984349663182).

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

981780007218 is a wasteful number, since it uses less digits than its factorization.

981780007218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52466.

The product of its (nonzero) digits is 451584, while the sum is 51.

The spelling of 981780007218 in words is "nine hundred eighty-one billion, seven hundred eighty million, seven thousand, two hundred eighteen".