686654730 has 24 divisors (see below), whose sum is σ = 1785302532. Its totient is φ = 183107904.

The previous prime is 686654677. The next prime is 686654747. The reversal of 686654730 is 37456686.

It can be written as a sum of positive squares in 2 ways, for example, as 682933689 + 3721041 = 26133^2 + 1929^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3814659 + ... + 3814838.

Almost surely, 2^686654730 is an apocalyptic number.

686654730 is an abundant number, since it is smaller than the sum of its proper divisors (1098647802).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

686654730 is a wasteful number, since it uses less digits than its factorization.

686654730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7629510 (or 7629507 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The square root of 686654730 is about 26204.0975803404. The cubic root of 686654730 is about 882.2252266994.

The spelling of 686654730 in words is "six hundred eighty-six million, six hundred fifty-four thousand, seven hundred thirty".