81432767020 has 48 divisors (see below), whose sum is σ = 188402197536. Its totient is φ = 29318720000.

The previous prime is 81432766991. The next prime is 81432767027. The reversal of 81432767020 is 2076723418.

It is not an unprimeable number, because it can be changed into a prime (81432767027) by changing a digit.

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, 1810201 + ... + 1854640.

It is an arithmetic number, because the mean of its divisors is an integer number (3925045782).

Almost surely, 2^81432767020 is an apocalyptic number.

It is an amenable number.

81432767020 is an abundant number, since it is smaller than the sum of its proper divisors (106969430516).

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

81432767020 is a wasteful number, since it uses less digits than its factorization.

81432767020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3664962 (or 3664960 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 40.

The spelling of 81432767020 in words is "eighty-one billion, four hundred thirty-two million, seven hundred sixty-seven thousand, twenty".