81026872080 has 320 divisors, whose sum is σ = 313875910656. Its totient is φ = 16798464000.

The previous prime is 81026872049. The next prime is 81026872099. The reversal of 81026872080 is 8027862018.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8514525 + ... + 8524035.

Almost surely, 2^81026872080 is an apocalyptic number.

81026872080 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81026872080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156937955328).

81026872080 is an abundant number, since it is smaller than the sum of its proper divisors (232849038576).

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

81026872080 is a wasteful number, since it uses less digits than its factorization.

81026872080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10006 (or 10000 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 42.

The spelling of 81026872080 in words is "eighty-one billion, twenty-six million, eight hundred seventy-two thousand, eighty".