81764552 has 16 divisors (see below), whose sum is σ = 153948300. Its totient is φ = 40711680.

The previous prime is 81764539. The next prime is 81764569. The reversal of 81764552 is 25546718.

It can be written as a sum of positive squares in 2 ways, for example, as 77545636 + 4218916 = 8806^2 + 2054^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19277 + ... + 23132.

Almost surely, 2^81764552 is an apocalyptic number.

It is an amenable number.

81764552 is a deficient number, since it is larger than the sum of its proper divisors (72183748).

81764552 is a wasteful number, since it uses less digits than its factorization.

81764552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42656 (or 42652 counting only the distinct ones).

The product of its digits is 67200, while the sum is 38.

The square root of 81764552 is about 9042.3753516430. The cubic root of 81764552 is about 434.0319371685.

The spelling of 81764552 in words is "eighty-one million, seven hundred sixty-four thousand, five hundred fifty-two".