81647067 has 8 divisors (see below), whose sum is σ = 111394624. Its totient is φ = 53165448.

The previous prime is 81647063. The next prime is 81647077. The reversal of 81647067 is 76074618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81647067 - 2² = 81647063 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81647063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 316333 + ... + 316590.

It is an arithmetic number, because the mean of its divisors is an integer number (13924328).

Almost surely, 2^81647067 is an apocalyptic number.

81647067 is a deficient number, since it is larger than the sum of its proper divisors (29747557).

81647067 is a wasteful number, since it uses less digits than its factorization.

81647067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632969.

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 81647067 is about 9035.8766591848. The cubic root of 81647067 is about 433.8239550888.

The spelling of 81647067 in words is "eighty-one million, six hundred forty-seven thousand, sixty-seven".