81713704 has 24 divisors (see below), whose sum is σ = 156460410. Its totient is φ = 39994656.

The previous prime is 81713689. The next prime is 81713741. The reversal of 81713704 is 40731718.

It can be written as a sum of positive squares in only one way, i.e., 62441604 + 19272100 = 7902^2 + 4390^2 .

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, 185917 + ... + 186355.

Almost surely, 2^81713704 is an apocalyptic number.

It is an amenable number.

81713704 is a deficient number, since it is larger than the sum of its proper divisors (74746706).

81713704 is an equidigital number, since it uses as much as digits as its factorization.

81713704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 937 (or 494 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 81713704 is about 9039.5632637866. The cubic root of 81713704 is about 433.9419461235.

The spelling of 81713704 in words is "eighty-one million, seven hundred thirteen thousand, seven hundred four".