81941376 has 128 divisors (see below), whose sum is σ = 250185600. Its totient is φ = 23500800.

The previous prime is 81941371. The next prime is 81941381. The reversal of 81941376 is 67314918.

It is an interprime number because it is at equal distance from previous prime (81941371) and next prime (81941381).

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81941371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79746 + ... + 80766.

It is an arithmetic number, because the mean of its divisors is an integer number (1954575).

Almost surely, 2^81941376 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 81941376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125092800).

81941376 is an abundant number, since it is smaller than the sum of its proper divisors (168244224).

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

81941376 is a wasteful number, since it uses less digits than its factorization.

81941376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068 (or 1056 counting only the distinct ones).

The product of its digits is 36288, while the sum is 39.

The square root of 81941376 is about 9052.1475904892. The cubic root of 81941376 is about 434.3445910151.

It can be divided in two parts, 819 and 41376, that added together give a triangular number (42195 = T₂₉₀).

The spelling of 81941376 in words is "eighty-one million, nine hundred forty-one thousand, three hundred seventy-six".