81034037440 has 56 divisors (see below), whose sum is σ = 198177527952. Its totient is φ = 31537566720.

The previous prime is 81034037429. The next prime is 81034037443. The reversal of 81034037440 is 4473043018.

It is a super-3 number, since 3×81034037440³ (a number of 34 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81034037396 and 81034037405.

It is not an unprimeable number, because it can be changed into a prime (81034037443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3410206 + ... + 3433885.

Almost surely, 2^81034037440 is an apocalyptic number.

81034037440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81034037440 is an abundant number, since it is smaller than the sum of its proper divisors (117143490512).

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

81034037440 is a wasteful number, since it uses less digits than its factorization.

81034037440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6844145 (or 6844135 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 34.

The spelling of 81034037440 in words is "eighty-one billion, thirty-four million, thirty-seven thousand, four hundred forty".