81647083 has 24 divisors (see below), whose sum is σ = 97880400. Its totient is φ = 67878720.

The previous prime is 81647077. The next prime is 81647129. The reversal of 81647083 is 38074618.

It is a happy number.

It is not a de Polignac number, because 81647083 - 2⁵ = 81647051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81647003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 386848 + ... + 387058.

It is an arithmetic number, because the mean of its divisors is an integer number (4078350).

Almost surely, 2^81647083 is an apocalyptic number.

81647083 is a deficient number, since it is larger than the sum of its proper divisors (16233317).

81647083 is a wasteful number, since it uses less digits than its factorization.

81647083 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427 (or 420 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 81647083 is about 9035.8775445443. The cubic root of 81647083 is about 433.8239834270.

The spelling of 81647083 in words is "eighty-one million, six hundred forty-seven thousand, eighty-three".