81232699392 has 672 divisors, whose sum is σ = 271836172608. Its totient is φ = 24078974976.

The previous prime is 81232699369. The next prime is 81232699409. The reversal of 81232699392 is 29399623218.

It is a super-2 number, since 2×81232699392² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1112776668 + ... + 1112776740.

It is an arithmetic number, because the mean of its divisors is an integer number (404518114).

Almost surely, 2^81232699392 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81232699392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135918086304).

81232699392 is an abundant number, since it is smaller than the sum of its proper divisors (190603473216).

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

81232699392 is an equidigital number, since it uses as much as digits as its factorization.

81232699392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170 (or 134 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 54.

The spelling of 81232699392 in words is "eighty-one billion, two hundred thirty-two million, six hundred ninety-nine thousand, three hundred ninety-two".