81036764 has 6 divisors (see below), whose sum is σ = 141814344. Its totient is φ = 40518380.

The previous prime is 81036763. The next prime is 81036793. The reversal of 81036764 is 46763018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81036763) by changing a digit.

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 as a sum of consecutive naturals, namely, 10129592 + ... + 10129599.

It is an arithmetic number, because the mean of its divisors is an integer number (23635724).

Almost surely, 2^81036764 is an apocalyptic number.

It is an amenable number.

81036764 is a deficient number, since it is larger than the sum of its proper divisors (60777580).

81036764 is a wasteful number, since it uses less digits than its factorization.

81036764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20259195 (or 20259193 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 81036764 is about 9002.0422127426. The cubic root of 81036764 is about 432.7403215160.

The spelling of 81036764 in words is "eighty-one million, thirty-six thousand, seven hundred sixty-four".