81545936 has 10 divisors (see below), whose sum is σ = 157995282. Its totient is φ = 40772960.

The previous prime is 81545927. The next prime is 81545951. The reversal of 81545936 is 63954518.

It can be written as a sum of positive squares in only one way, i.e., 78145600 + 3400336 = 8840^2 + 1844^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81545893 and 81545902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2548295 + ... + 2548326.

Almost surely, 2^81545936 is an apocalyptic number.

It is an amenable number.

81545936 is a deficient number, since it is larger than the sum of its proper divisors (76449346).

81545936 is a wasteful number, since it uses less digits than its factorization.

81545936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5096629 (or 5096623 counting only the distinct ones).

The product of its digits is 129600, while the sum is 41.

The square root of 81545936 is about 9030.2788439782. The cubic root of 81545936 is about 433.6447644220.

The spelling of 81545936 in words is "eighty-one million, five hundred forty-five thousand, nine hundred thirty-six".