81336592 has 10 divisors (see below), whose sum is σ = 157589678. Its totient is φ = 40668288.

The previous prime is 81336581. The next prime is 81336601. The reversal of 81336592 is 29563318.

It can be written as a sum of positive squares in only one way, i.e., 77158656 + 4177936 = 8784^2 + 2044^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2541753 + ... + 2541784.

Almost surely, 2^81336592 is an apocalyptic number.

It is an amenable number.

81336592 is a deficient number, since it is larger than the sum of its proper divisors (76253086).

81336592 is a wasteful number, since it uses less digits than its factorization.

81336592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5083545 (or 5083539 counting only the distinct ones).

The product of its digits is 38880, while the sum is 37.

The square root of 81336592 is about 9018.6801695148. The cubic root of 81336592 is about 433.2733634301.

The spelling of 81336592 in words is "eighty-one million, three hundred thirty-six thousand, five hundred ninety-two".