81286102560 has 192 divisors, whose sum is σ = 277576830720. Its totient is φ = 19876147200.

The previous prime is 81286102549. The next prime is 81286102561. The reversal of 81286102560 is 6520168218.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (81286102561) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 899106 + ... + 985374.

It is an arithmetic number, because the mean of its divisors is an integer number (1445712660).

Almost surely, 2^81286102560 is an apocalyptic number.

81286102560 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 81286102560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138788415360).

81286102560 is an abundant number, since it is smaller than the sum of its proper divisors (196290728160).

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

81286102560 is a wasteful number, since it uses less digits than its factorization.

81286102560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86451 (or 86443 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 39.

The spelling of 81286102560 in words is "eighty-one billion, two hundred eighty-six million, one hundred two thousand, five hundred sixty".