81944526 has 16 divisors (see below), whose sum is σ = 163987200. Its totient is φ = 27298488.

The previous prime is 81944521. The next prime is 81944543. The reversal of 81944526 is 62544918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81944521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11115 + ... + 16953.

It is an arithmetic number, because the mean of its divisors is an integer number (10249200).

Almost surely, 2^81944526 is an apocalyptic number.

81944526 is an abundant number, since it is smaller than the sum of its proper divisors (82042674).

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

81944526 is a wasteful number, since it uses less digits than its factorization.

81944526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8183.

The product of its digits is 69120, while the sum is 39.

The square root of 81944526 is about 9052.3215806775. The cubic root of 81944526 is about 434.3501566524.

It can be divided in two parts, 8194 and 4526, that added together give a triangular number (12720 = T₁₅₉).

The spelling of 81944526 in words is "eighty-one million, nine hundred forty-four thousand, five hundred twenty-six".