81544996 has 12 divisors (see below), whose sum is σ = 153681052. Its totient is φ = 37636128.

The previous prime is 81544961. The next prime is 81544999. The reversal of 81544996 is 69944518.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11655396 + 69889600 = 3414^2 + 8360^2 .

It is not an unprimeable number, because it can be changed into a prime (81544999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 784035 + ... + 784138.

Almost surely, 2^81544996 is an apocalyptic number.

It is an amenable number.

81544996 is a deficient number, since it is larger than the sum of its proper divisors (72136056).

81544996 is a wasteful number, since it uses less digits than its factorization.

81544996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1568190 (or 1568188 counting only the distinct ones).

The product of its digits is 311040, while the sum is 46.

The square root of 81544996 is about 9030.2267967089. The cubic root of 81544996 is about 433.6430981725.

The spelling of 81544996 in words is "eighty-one million, five hundred forty-four thousand, nine hundred ninety-six".