81464 has 16 divisors (see below), whose sum is σ = 162000. Its totient is φ = 38272.

The previous prime is 81463. The next prime is 81509. The reversal of 81464 is 46418.

It is a happy number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 81464.

It is not an unprimeable number, because it can be changed into a prime (81463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164 + ... + 435.

It is an arithmetic number, because the mean of its divisors is an integer number (10125).

2⁸¹⁴⁶⁴ is an apocalyptic number.

It is an amenable number.

81464 is a deficient number, since it is larger than the sum of its proper divisors (80536).

81464 is a wasteful number, since it uses less digits than its factorization.

81464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622 (or 618 counting only the distinct ones).

The product of its digits is 768, while the sum is 23.

The square root of 81464 is about 285.4189902582. The cubic root of 81464 is about 43.3499476068.

It can be divided in two parts, 814 and 64, that added together give a palindrome (878).

The spelling of 81464 in words is "eighty-one thousand, four hundred sixty-four".