81320294008 has 32 divisors (see below), whose sum is σ = 156655904400. Its totient is φ = 39546220032.

The previous prime is 81320293991. The next prime is 81320294023. The reversal of 81320294008 is 80049202318.

It is a super-2 number, since 2×81320294008² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 750528 + ... + 852016.

Almost surely, 2^81320294008 is an apocalyptic number.

It is an amenable number.

81320294008 is a deficient number, since it is larger than the sum of its proper divisors (75335610392).

81320294008 is a wasteful number, since it uses less digits than its factorization.

81320294008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104239 (or 104235 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The spelling of 81320294008 in words is "eighty-one billion, three hundred twenty million, two hundred ninety-four thousand, eight".