81464736 has 24 divisors (see below), whose sum is σ = 213845184. Its totient is φ = 27154880.

The previous prime is 81464711. The next prime is 81464743. The reversal of 81464736 is 63746418.

It is a tau number, because it is divible by the number of its divisors (24).

It is a junction number, because it is equal to n+sod(n) for n = 81464694 and 81464703.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 424200 + ... + 424391.

It is an arithmetic number, because the mean of its divisors is an integer number (8910216).

Almost surely, 2^81464736 is an apocalyptic number.

It is an amenable number.

81464736 is an abundant number, since it is smaller than the sum of its proper divisors (132380448).

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

81464736 is a wasteful number, since it uses less digits than its factorization.

81464736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848604 (or 848596 counting only the distinct ones).

The product of its digits is 96768, while the sum is 39.

The square root of 81464736 is about 9025.7817389964. The cubic root of 81464736 is about 433.5007815718.

The spelling of 81464736 in words is "eighty-one million, four hundred sixty-four thousand, seven hundred thirty-six".