687166249 has 24 divisors (see below), whose sum is σ = 876089088. Its totient is φ = 532959840.

The previous prime is 687166201. The next prime is 687166307. The reversal of 687166249 is 942661786.

687166249 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 687166249 - 2⁷ = 687166121 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (687166349) 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, 117339 + ... + 123055.

It is an arithmetic number, because the mean of its divisors is an integer number (36503712).

Almost surely, 2^687166249 is an apocalyptic number.

It is an amenable number.

687166249 is a deficient number, since it is larger than the sum of its proper divisors (188922839).

687166249 is a wasteful number, since it uses less digits than its factorization.

687166249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5965 (or 5958 counting only the distinct ones).

The product of its digits is 870912, while the sum is 49.

The square root of 687166249 is about 26213.8560498069. The cubic root of 687166249 is about 882.4442416494. Note that the first 3 decimals are identical.

The spelling of 687166249 in words is "six hundred eighty-seven million, one hundred sixty-six thousand, two hundred forty-nine".