81364360 has 64 divisors (see below), whose sum is σ = 228251520. Its totient is φ = 25359360.

The previous prime is 81364357. The next prime is 81364373. The reversal of 81364360 is 6346318.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10129 + ... + 16288.

It is an arithmetic number, because the mean of its divisors is an integer number (3566430).

Almost surely, 2^81364360 is an apocalyptic number.

It is an amenable number.

81364360 is an abundant number, since it is smaller than the sum of its proper divisors (146887160).

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

81364360 is a wasteful number, since it uses less digits than its factorization.

81364360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26446 (or 26442 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 81364360 is about 9020.2195095241. The cubic root of 81364360 is about 433.3226637741.

The spelling of 81364360 in words is "eighty-one million, three hundred sixty-four thousand, three hundred sixty".