81464365 has 8 divisors (see below), whose sum is σ = 98270208. Its totient is φ = 64829520.

The previous prime is 81464359. The next prime is 81464377. The reversal of 81464365 is 56346418.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81464365 - 2⁵ = 81464333 is a prime.

It is a Duffinian number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 41697 + ... + 43606.

It is an arithmetic number, because the mean of its divisors is an integer number (12283776).

Almost surely, 2^81464365 is an apocalyptic number.

It is an amenable number.

81464365 is a deficient number, since it is larger than the sum of its proper divisors (16805843).

81464365 is a wasteful number, since it uses less digits than its factorization.

81464365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85499.

The product of its digits is 69120, while the sum is 37.

The square root of 81464365 is about 9025.7611867366. The cubic root of 81464365 is about 433.5001234996.

The spelling of 81464365 in words is "eighty-one million, four hundred sixty-four thousand, three hundred sixty-five".