81853080 has 128 divisors (see below), whose sum is σ = 260409600. Its totient is φ = 20547072.

The previous prime is 81853061. The next prime is 81853091. The reversal of 81853080 is 8035818.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 149367 + ... + 149913.

It is an arithmetic number, because the mean of its divisors is an integer number (2034450).

Almost surely, 2^81853080 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 81853080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130204800).

81853080 is an abundant number, since it is smaller than the sum of its proper divisors (178556520).

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

81853080 is a wasteful number, since it uses less digits than its factorization.

81853080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633 (or 629 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 33.

The square root of 81853080 is about 9047.2692012563. The cubic root of 81853080 is about 434.1885254833.

Adding to 81853080 its reverse (8035818), we get a palindrome (89888898).

The spelling of 81853080 in words is "eighty-one million, eight hundred fifty-three thousand, eighty".