81907988480 has 48 divisors (see below), whose sum is σ = 196531203960. Its totient is φ = 32763191296.

The previous prime is 81907988479. The next prime is 81907988501. The reversal of 81907988480 is 8488970918.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3989174 + ... + 4009653.

Almost surely, 2^81907988480 is an apocalyptic number.

81907988480 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81907988480 is an abundant number, since it is smaller than the sum of its proper divisors (114623215480).

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

81907988480 is an equidigital number, since it uses as much as digits as its factorization.

81907988480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7998854 (or 7998834 counting only the distinct ones).

The product of its (nonzero) digits is 9289728, while the sum is 62.

The spelling of 81907988480 in words is "eighty-one billion, nine hundred seven million, nine hundred eighty-eight thousand, four hundred eighty".