81944528 has 10 divisors (see below), whose sum is σ = 158767554. Its totient is φ = 40972256.

The previous prime is 81944521. The next prime is 81944543. The reversal of 81944528 is 82544918.

It can be written as a sum of positive squares in only one way, i.e., 77651344 + 4293184 = 8812^2 + 2072^2 .

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 as a sum of consecutive naturals, namely, 2560751 + ... + 2560782.

Almost surely, 2^81944528 is an apocalyptic number.

It is an amenable number.

81944528 is a deficient number, since it is larger than the sum of its proper divisors (76823026).

81944528 is a wasteful number, since it uses less digits than its factorization.

81944528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5121541 (or 5121535 counting only the distinct ones).

The product of its digits is 92160, while the sum is 41.

The square root of 81944528 is about 9052.3216911464. The cubic root of 81944528 is about 434.3501601861.

The spelling of 81944528 in words is "eighty-one million, nine hundred forty-four thousand, five hundred twenty-eight".