81037716 has 48 divisors (see below), whose sum is σ = 196472640. Its totient is φ = 25966080.

The previous prime is 81037711. The next prime is 81037727. The reversal of 81037716 is 61773018.

It is a super-2 number, since 2×81037716² = 13134222828993312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81037711) 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 15 ways as a sum of consecutive naturals, for example, 116931 + ... + 117621.

It is an arithmetic number, because the mean of its divisors is an integer number (4093180).

Almost surely, 2^81037716 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 81037716, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98236320).

81037716 is an abundant number, since it is smaller than the sum of its proper divisors (115434924).

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

81037716 is a wasteful number, since it uses less digits than its factorization.

81037716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1064 (or 1062 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 33.

The square root of 81037716 is about 9002.0950894778. The cubic root of 81037716 is about 432.7420160851.

The spelling of 81037716 in words is "eighty-one million, thirty-seven thousand, seven hundred sixteen".