81724945074 has 32 divisors (see below), whose sum is σ = 167356622400. Its totient is φ = 26591326272.

The previous prime is 81724945061. The next prime is 81724945129. The reversal of 81724945074 is 47054942718.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 312852 + ... + 511200.

It is an arithmetic number, because the mean of its divisors is an integer number (5229894450).

Almost surely, 2^81724945074 is an apocalyptic number.

81724945074 is an abundant number, since it is smaller than the sum of its proper divisors (85631677326).

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

81724945074 is a wasteful number, since it uses less digits than its factorization.

81724945074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199994.

The product of its (nonzero) digits is 2257920, while the sum is 51.

The spelling of 81724945074 in words is "eighty-one billion, seven hundred twenty-four million, nine hundred forty-five thousand, seventy-four".