81346826448 has 50 divisors (see below), whose sum is σ = 235441320114. Its totient is φ = 27115608384.

The previous prime is 81346826447. The next prime is 81346826467. The reversal of 81346826448 is 84462864318.

It is a happy number.

81346826448 is a `hidden beast` number, since 8 + 134 + 68 + 2 + 6 + 448 = 666.

It can be written as a sum of positive squares in only one way, i.e., 74110261824 + 7236564624 = 272232^2 + 85068^2 .

It is a super-2 number, since 2×81346826448² (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 junction number, because it is equal to n+sod(n) for n = 81346826394 and 81346826403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81346826447) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 31382511 + ... + 31385102.

Almost surely, 2^81346826448 is an apocalyptic number.

It is an amenable number.

81346826448 is an abundant number, since it is smaller than the sum of its proper divisors (154094493666).

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

81346826448 is a wasteful number, since it uses less digits than its factorization.

81346826448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62767633 (or 62767618 counting only the distinct ones).

The product of its digits is 7077888, while the sum is 54.

The spelling of 81346826448 in words is "eighty-one billion, three hundred forty-six million, eight hundred twenty-six thousand, four hundred forty-eight".