1264855686 has 8 divisors (see below), whose sum is σ = 2529711384. Its totient is φ = 421618560.

The previous prime is 1264855663. The next prime is 1264855687. The reversal of 1264855686 is 6865584621.

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

1264855686 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264855687) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 105404635 + ... + 105404646.

It is an arithmetic number, because the mean of its divisors is an integer number (316213923).

Almost surely, 2^1264855686 is an apocalyptic number.

1264855686 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1264855686 is a wasteful number, since it uses less digits than its factorization.

1264855686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210809286.

The product of its digits is 2764800, while the sum is 51.

The square root of 1264855686 is about 35564.8096578626. The cubic root of 1264855686 is about 1081.4679643627.

The spelling of 1264855686 in words is "one billion, two hundred sixty-four million, eight hundred fifty-five thousand, six hundred eighty-six".