81794002580 has 48 divisors (see below), whose sum is σ = 173592546960. Its totient is φ = 32370167808.

The previous prime is 81794002567. The next prime is 81794002607. The reversal of 81794002580 is 8520049718.

It can be written as a sum of positive squares in 8 ways, for example, as 3249456016 + 78544546564 = 57004^2 + 280258^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10497326 + ... + 10505114.

It is an arithmetic number, because the mean of its divisors is an integer number (3616511395).

Almost surely, 2^81794002580 is an apocalyptic number.

It is an amenable number.

81794002580 is an abundant number, since it is smaller than the sum of its proper divisors (91798544380).

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

81794002580 is a wasteful number, since it uses less digits than its factorization.

81794002580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13308 (or 13306 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 44.

The spelling of 81794002580 in words is "eighty-one billion, seven hundred ninety-four million, two thousand, five hundred eighty".