81779236300 has 36 divisors (see below), whose sum is σ = 178101656320. Its totient is φ = 32593590720.

The previous prime is 81779236267. The next prime is 81779236313. The reversal of 81779236300 is 363297718.

It is a happy number.

It is a super-2 number, since 2×81779236300² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1448460 + ... + 1503859.

Almost surely, 2^81779236300 is an apocalyptic number.

It is an amenable number.

81779236300 is an abundant number, since it is smaller than the sum of its proper divisors (96322420020).

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

81779236300 is a wasteful number, since it uses less digits than its factorization.

81779236300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2952610 (or 2952603 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 46.

The spelling of 81779236300 in words is "eighty-one billion, seven hundred seventy-nine million, two hundred thirty-six thousand, three hundred".