687663953 has 4 divisors (see below), whose sum is σ = 696368640. Its totient is φ = 678959268.

The previous prime is 687663937. The next prime is 687663971. The reversal of 687663953 is 359366786.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 687663953 - 2⁴ = 687663937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 687663895 and 687663904.

It is not an unprimeable number, because it can be changed into a prime (687663973) 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 3 ways as a sum of consecutive naturals, for example, 4352225 + ... + 4352382.

It is an arithmetic number, because the mean of its divisors is an integer number (174092160).

Almost surely, 2^687663953 is an apocalyptic number.

It is an amenable number.

687663953 is a deficient number, since it is larger than the sum of its proper divisors (8704687).

687663953 is an equidigital number, since it uses as much as digits as its factorization.

687663953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8704686.

The product of its digits is 4898880, while the sum is 53.

The square root of 687663953 is about 26223.3474789166. The cubic root of 687663953 is about 882.6572371886.

The spelling of 687663953 in words is "six hundred eighty-seven million, six hundred sixty-three thousand, nine hundred fifty-three".