81464684 has 12 divisors (see below), whose sum is σ = 162929424. Its totient is φ = 34913424.

The previous prime is 81464659. The next prime is 81464687. The reversal of 81464684 is 48646418.

81464684 is an admirable number.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (81464687) 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, 1454699 + ... + 1454754.

It is an arithmetic number, because the mean of its divisors is an integer number (13577452).

Almost surely, 2^81464684 is an apocalyptic number.

It is an amenable number.

81464684 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81464684 is a wasteful number, since it uses less digits than its factorization.

81464684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2909464 (or 2909462 counting only the distinct ones).

The product of its digits is 147456, while the sum is 41.

The square root of 81464684 is about 9025.7788583590. The cubic root of 81464684 is about 433.5006893354.

The spelling of 81464684 in words is "eighty-one million, four hundred sixty-four thousand, six hundred eighty-four".