81713484 has 18 divisors (see below), whose sum is σ = 206553620. Its totient is φ = 27237816.

The previous prime is 81713473. The next prime is 81713491. The reversal of 81713484 is 48431718.

81713484 is a `hidden beast` number, since 8 + 171 + 3 + 484 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 2269819 = 81713484 / (8 + 1 + 7 + 1 + 3 + 4 + 8 + 4).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1134874 + ... + 1134945.

Almost surely, 2^81713484 is an apocalyptic number.

It is an amenable number.

81713484 is an abundant number, since it is smaller than the sum of its proper divisors (124840136).

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

81713484 is a wasteful number, since it uses less digits than its factorization.

81713484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2269829 (or 2269824 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 81713484 is about 9039.5510950489. The cubic root of 81713484 is about 433.9415566853.

The spelling of 81713484 in words is "eighty-one million, seven hundred thirteen thousand, four hundred eighty-four".