81567696 has 160 divisors (see below), whose sum is σ = 255983616. Its totient is φ = 21888000.

The previous prime is 81567679. The next prime is 81567697. The reversal of 81567696 is 69676518.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81567697) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 426961 + ... + 427151.

Almost surely, 2^81567696 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 81567696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127991808).

81567696 is an abundant number, since it is smaller than the sum of its proper divisors (174415920).

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

81567696 is a wasteful number, since it uses less digits than its factorization.

81567696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281 (or 275 counting only the distinct ones).

The product of its digits is 544320, while the sum is 48.

The square root of 81567696 is about 9031.4835990550. The cubic root of 81567696 is about 433.6833327486.

The spelling of 81567696 in words is "eighty-one million, five hundred sixty-seven thousand, six hundred ninety-six".