687989763 has 18 divisors (see below), whose sum is σ = 999002004. Its totient is φ = 456249672.

The previous prime is 687989761. The next prime is 687989773. The reversal of 687989763 is 367989786.

It is a happy number.

It is not a de Polignac number, because 687989763 - 2¹ = 687989761 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 687989763.

It is not an unprimeable number, because it can be changed into a prime (687989761) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1378488 + ... + 1378986.

Almost surely, 2^687989763 is an apocalyptic number.

687989763 is a deficient number, since it is larger than the sum of its proper divisors (311012241).

687989763 is an equidigital number, since it uses as much as digits as its factorization.

687989763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311 (or 809 counting only the distinct ones).

The product of its digits is 27433728, while the sum is 63.

The square root of 687989763 is about 26229.5589554990. The cubic root of 687989763 is about 882.7966139620.

The spelling of 687989763 in words is "six hundred eighty-seven million, nine hundred eighty-nine thousand, seven hundred sixty-three".