717278081 has 12 divisors (see below), whose sum is σ = 788302512. Its totient is φ = 652210416.

The previous prime is 717278027. The next prime is 717278087. The reversal of 717278081 is 180872717.

It is a de Polignac number, because none of the positive numbers 2^k-717278081 is a prime.

It is a super-2 number, since 2×717278081² = 1028975690966085122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (717278087) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20351 + ... + 42996.

It is an arithmetic number, because the mean of its divisors is an integer number (65691876).

Almost surely, 2^717278081 is an apocalyptic number.

It is an amenable number.

717278081 is a deficient number, since it is larger than the sum of its proper divisors (71024431).

717278081 is a wasteful number, since it uses less digits than its factorization.

717278081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63440 (or 63427 counting only the distinct ones).

The product of its (nonzero) digits is 43904, while the sum is 41.

The square root of 717278081 is about 26782.0477372437. The cubic root of 717278081 is about 895.1500766819.

The spelling of 717278081 in words is "seven hundred seventeen million, two hundred seventy-eight thousand, eighty-one".