687717457 has 24 divisors (see below), whose sum is σ = 826226240. Its totient is φ = 560688480.

The previous prime is 687717377. The next prime is 687717461. The reversal of 687717457 is 754717786.

It is a happy number.

It is not a de Polignac number, because 687717457 - 2¹¹ = 687715409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (687717467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 847582 + ... + 848392.

Almost surely, 2^687717457 is an apocalyptic number.

It is an amenable number.

687717457 is a deficient number, since it is larger than the sum of its proper divisors (138508783).

687717457 is a wasteful number, since it uses less digits than its factorization.

687717457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1093 (or 1070 counting only the distinct ones).

The product of its digits is 2304960, while the sum is 52.

The square root of 687717457 is about 26224.3676186863. The cubic root of 687717457 is about 882.6801284413.

The spelling of 687717457 in words is "six hundred eighty-seven million, seven hundred seventeen thousand, four hundred fifty-seven".