687563678 has 8 divisors (see below), whose sum is σ = 1085626920. Its totient is φ = 325688040.

The previous prime is 687563677. The next prime is 687563683. The reversal of 687563678 is 876365786.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×687563678² = 945487622609775368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687563671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9046853 + ... + 9046928.

It is an arithmetic number, because the mean of its divisors is an integer number (135703365).

Almost surely, 2^687563678 is an apocalyptic number.

687563678 is a deficient number, since it is larger than the sum of its proper divisors (398063242).

687563678 is a wasteful number, since it uses less digits than its factorization.

687563678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18093802.

The product of its digits is 10160640, while the sum is 56.

The square root of 687563678 is about 26221.4354679526. The cubic root of 687563678 is about 882.6143321444.

The spelling of 687563678 in words is "six hundred eighty-seven million, five hundred sixty-three thousand, six hundred seventy-eight".