81926080 has 28 divisors (see below), whose sum is σ = 195087240. Its totient is φ = 32770304.

The previous prime is 81926057. The next prime is 81926083. The reversal of 81926080 is 8062918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81926083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127690 + ... + 128329.

Almost surely, 2^81926080 is an apocalyptic number.

81926080 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81926080 is an abundant number, since it is smaller than the sum of its proper divisors (113161160).

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

81926080 is a wasteful number, since it uses less digits than its factorization.

81926080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256036 (or 256026 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 81926080 is about 9051.3026686770. The cubic root of 81926080 is about 434.3175629591.

Adding to 81926080 its reverse (8062918), we get a palindrome (89988998).

The spelling of 81926080 in words is "eighty-one million, nine hundred twenty-six thousand, eighty".