81717000 has 64 divisors (see below), whose sum is σ = 254966400. Its totient is φ = 21790400.

The previous prime is 81716959. The next prime is 81717001. The reversal of 81717000 is 71718.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (81717001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10620 + ... + 16619.

It is an arithmetic number, because the mean of its divisors is an integer number (3983850).

Almost surely, 2^81717000 is an apocalyptic number.

It is an amenable number.

81717000 is an abundant number, since it is smaller than the sum of its proper divisors (173249400).

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

81717000 is a wasteful number, since it uses less digits than its factorization.

81717000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27263 (or 27249 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 24.

The square root of 81717000 is about 9039.7455716408. The cubic root of 81717000 is about 433.9477805322.

Adding to 81717000 its reverse (71718), we get a palindrome (81788718).

The spelling of 81717000 in words is "eighty-one million, seven hundred seventeen thousand".