686649298 has 8 divisors (see below), whose sum is σ = 1065490380. Its totient is φ = 331485840.

The previous prime is 686649253. The next prime is 686649361. The reversal of 686649298 is 892946686.

It can be written as a sum of positive squares in 2 ways, for example, as 637411009 + 49238289 = 25247^2 + 7017^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (58), and also a Moran number because the ratio is a prime number: 11838781 = 686649298 / (6 + 8 + 6 + 6 + 4 + 9 + 2 + 9 + 8).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5919333 + ... + 5919448.

Almost surely, 2^686649298 is an apocalyptic number.

686649298 is a deficient number, since it is larger than the sum of its proper divisors (378841082).

686649298 is a wasteful number, since it uses less digits than its factorization.

686649298 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11838812.

The product of its digits is 8957952, while the sum is 58.

The square root of 686649298 is about 26203.9939322234. The cubic root of 686649298 is about 882.2229003191. Note that the first 3 decimals are identical.

The spelling of 686649298 in words is "six hundred eighty-six million, six hundred forty-nine thousand, two hundred ninety-eight".