81140588832 has 48 divisors (see below), whose sum is σ = 218189032992. Its totient is φ = 26387182080.

The previous prime is 81140588797. The next prime is 81140588863. The reversal of 81140588832 is 23888504118.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10303558 + ... + 10311429.

It is an arithmetic number, because the mean of its divisors is an integer number (4545604854).

Almost surely, 2^81140588832 is an apocalyptic number.

81140588832 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is an amenable number.

81140588832 is an abundant number, since it is smaller than the sum of its proper divisors (137048444160).

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

81140588832 is a wasteful number, since it uses less digits than its factorization.

81140588832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20615041 (or 20615033 counting only the distinct ones).

The product of its (nonzero) digits is 491520, while the sum is 48.

The spelling of 81140588832 in words is "eighty-one billion, one hundred forty million, five hundred eighty-eight thousand, eight hundred thirty-two".