81347576 has 8 divisors (see below), whose sum is σ = 152526720. Its totient is φ = 40673784.

The previous prime is 81347561. The next prime is 81347579. The reversal of 81347576 is 67574318.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81347579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5084216 + ... + 5084231.

It is an arithmetic number, because the mean of its divisors is an integer number (19065840).

Almost surely, 2^81347576 is an apocalyptic number.

It is an amenable number.

81347576 is a deficient number, since it is larger than the sum of its proper divisors (71179144).

81347576 is a wasteful number, since it uses less digits than its factorization.

81347576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10168453 (or 10168449 counting only the distinct ones).

The product of its digits is 141120, while the sum is 41.

The square root of 81347576 is about 9019.2891072412. The cubic root of 81347576 is about 433.2928661750.

The spelling of 81347576 in words is "eighty-one million, three hundred forty-seven thousand, five hundred seventy-six".