81736488 has 24 divisors (see below), whose sum is σ = 221369850. Its totient is φ = 27245472.

The previous prime is 81736477. The next prime is 81736489. The reversal of 81736488 is 88463718.

It can be written as a sum of positive squares in only one way, i.e., 81324324 + 412164 = 9018^2 + 642^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (81736489) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 567543 + ... + 567686.

Almost surely, 2^81736488 is an apocalyptic number.

It is an amenable number.

81736488 is an abundant number, since it is smaller than the sum of its proper divisors (139633362).

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

81736488 is a wasteful number, since it uses less digits than its factorization.

81736488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1135241 (or 1135234 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 81736488 is about 9040.8234138269. The cubic root of 81736488 is about 433.9822739757.

The spelling of 81736488 in words is "eighty-one million, seven hundred thirty-six thousand, four hundred eighty-eight".