717487987 has 16 divisors (see below), whose sum is σ = 743982624. Its totient is φ = 691488000.

The previous prime is 717487957. The next prime is 717487993. The reversal of 717487987 is 789784717.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-717487987 is a prime.

It is a super-2 number, since 2×717487987² = 1029578022978624338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (717487957) 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, 1704037 + ... + 1704457.

It is an arithmetic number, because the mean of its divisors is an integer number (46498914).

Almost surely, 2^717487987 is an apocalyptic number.

717487987 is a deficient number, since it is larger than the sum of its proper divisors (26494637).

717487987 is a wasteful number, since it uses less digits than its factorization.

717487987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870.

The product of its digits is 5531904, while the sum is 58.

The square root of 717487987 is about 26785.9662323389. The cubic root of 717487987 is about 895.2373877964.

The spelling of 717487987 in words is "seven hundred seventeen million, four hundred eighty-seven thousand, nine hundred eighty-seven".