81869232384 has 135 divisors (see below), whose sum is σ = 244242157467. Its totient is φ = 27276009984.

The previous prime is 81869232371. The next prime is 81869232407. The reversal of 81869232384 is 48323296818.

The square root of 81869232384 is 286128.

It is a perfect power (a square), and thus also a powerful number.

81869232384 is a `hidden beast` number, since 81 + 86 + 92 + 323 + 84 = 666.

It is a super-2 number, since 2×81869232384² (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 a self number, because there is not a number n which added to its sum of digits gives 81869232384.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 41201439 + ... + 41203425.

Almost surely, 2^81869232384 is an apocalyptic number.

81869232384 is the 286128-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81869232384

81869232384 is an abundant number, since it is smaller than the sum of its proper divisors (162372925083).

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

81869232384 is an frugal number, since it uses more digits than its factorization.

81869232384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4002 (or 1992 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 54.

The spelling of 81869232384 in words is "eighty-one billion, eight hundred sixty-nine million, two hundred thirty-two thousand, three hundred eighty-four".