981791987830 has 64 divisors (see below), whose sum is σ = 1858494451968. Its totient is φ = 372956088960.

The previous prime is 981791987809. The next prime is 981791987893. The reversal of 981791987830 is 38789197189.

It is a super-3 number, since 3×981791987830³ (a number of 37 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 981791987830.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23573725 + ... + 23615335.

It is an arithmetic number, because the mean of its divisors is an integer number (29038975812).

Almost surely, 2^981791987830 is an apocalyptic number.

981791987830 is a deficient number, since it is larger than the sum of its proper divisors (876702464138).

981791987830 is a wasteful number, since it uses less digits than its factorization.

981791987830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43181.

The product of its (nonzero) digits is 54867456, while the sum is 70.

The spelling of 981791987830 in words is "nine hundred eighty-one billion, seven hundred ninety-one million, nine hundred eighty-seven thousand, eight hundred thirty".