81037776 has 80 divisors (see below), whose sum is σ = 226485504. Its totient is φ = 24870912.

The previous prime is 81037741. The next prime is 81037783. The reversal of 81037776 is 67773018.

It is a super-2 number, since 2×81037776² = 13134242278052352, which contains 22 as substring.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 37296 + ... + 39408.

Almost surely, 2^81037776 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 81037776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113242752).

81037776 is an abundant number, since it is smaller than the sum of its proper divisors (145447728).

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

81037776 is a wasteful number, since it uses less digits than its factorization.

81037776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2188 (or 2182 counting only the distinct ones).

The product of its (nonzero) digits is 49392, while the sum is 39.

The square root of 81037776 is about 9002.0984220347. The cubic root of 81037776 is about 432.7421228852.

The spelling of 81037776 in words is "eighty-one million, thirty-seven thousand, seven hundred seventy-six".