687669969 has 24 divisors (see below), whose sum is σ = 1068685248. Its totient is φ = 392182560.

The previous prime is 687669967. The next prime is 687669973. The reversal of 687669969 is 969966786.

It is not a de Polignac number, because 687669969 - 2¹ = 687669967 is a prime.

It is a super-2 number, since 2×687669969² = 945779972528921922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (687669967) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75204 + ... + 83850.

It is an arithmetic number, because the mean of its divisors is an integer number (44528552).

Almost surely, 2^687669969 is an apocalyptic number.

It is an amenable number.

687669969 is a deficient number, since it is larger than the sum of its proper divisors (381015279).

687669969 is a wasteful number, since it uses less digits than its factorization.

687669969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9205 (or 9198 counting only the distinct ones).

The product of its digits is 52907904, while the sum is 66.

The square root of 687669969 is about 26223.4621856078. The cubic root of 687669969 is about 882.6598111447.

The spelling of 687669969 in words is "six hundred eighty-seven million, six hundred sixty-nine thousand, nine hundred sixty-nine".