81359376 has 160 divisors (see below), whose sum is σ = 253698048. Its totient is φ = 21980160.

The previous prime is 81359363. The next prime is 81359381. The reversal of 81359376 is 67395318.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 760315 + ... + 760421.

Almost surely, 2^81359376 is an apocalyptic number.

81359376 is the 5208-th octagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81359376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126849024).

81359376 is an abundant number, since it is smaller than the sum of its proper divisors (172338672).

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

81359376 is a wasteful number, since it uses less digits than its factorization.

81359376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229 (or 223 counting only the distinct ones).

The product of its digits is 136080, while the sum is 42.

The square root of 81359376 is about 9019.9432370719. The cubic root of 81359376 is about 433.3138158205.

The spelling of 81359376 in words is "eighty-one million, three hundred fifty-nine thousand, three hundred seventy-six".