81897615260 has 96 divisors (see below), whose sum is σ = 183551235840. Its totient is φ = 30587445248.

The previous prime is 81897615259. The next prime is 81897615281. The reversal of 81897615260 is 6251679818.

It is a congruent number.

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, 33467357 + ... + 33469803.

It is an arithmetic number, because the mean of its divisors is an integer number (1911992040).

Almost surely, 2^81897615260 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81897615260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91775617920).

81897615260 is an abundant number, since it is smaller than the sum of its proper divisors (101653620580).

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

81897615260 is a wasteful number, since it uses less digits than its factorization.

81897615260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3215 (or 3213 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 53.

The spelling of 81897615260 in words is "eighty-one billion, eight hundred ninety-seven million, six hundred fifteen thousand, two hundred sixty".