81264345750380 has 96 divisors (see below), whose sum is σ = 187311187312704. Its totient is φ = 29429545227264.

The previous prime is 81264345750331. The next prime is 81264345750397. The reversal of 81264345750380 is 8305754346218.

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, 41301854 + ... + 43224666.

It is an arithmetic number, because the mean of its divisors is an integer number (1951158201174).

Almost surely, 2^{81264345750380} 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 81264345750380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93655593656352).

81264345750380 is an abundant number, since it is smaller than the sum of its proper divisors (106046841562324).

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

81264345750380 is a wasteful number, since it uses less digits than its factorization.

81264345750380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1925955 (or 1925953 counting only the distinct ones).

The product of its (nonzero) digits is 19353600, while the sum is 56.

The spelling of 81264345750380 in words is "eighty-one trillion, two hundred sixty-four billion, three hundred forty-five million, seven hundred fifty thousand, three hundred eighty".