81107867280 has 160 divisors (see below), whose sum is σ = 288728663040. Its totient is φ = 18627632640.

The previous prime is 81107867279. The next prime is 81107867293. The reversal of 81107867280 is 8276870118.

It is a super-2 number, since 2×81107867280² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 758332 + ... + 858651.

It is an arithmetic number, because the mean of its divisors is an integer number (1804554144).

Almost surely, 2^81107867280 is an apocalyptic number.

81107867280 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81107867280 is an abundant number, since it is smaller than the sum of its proper divisors (207620795760).

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

81107867280 is a wasteful number, since it uses less digits than its factorization.

81107867280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1617029 (or 1617023 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 48.

The spelling of 81107867280 in words is "eighty-one billion, one hundred seven million, eight hundred sixty-seven thousand, two hundred eighty".