686138633 has 8 divisors (see below), whose sum is σ = 689925600. Its totient is φ = 682359328.

The previous prime is 686138627. The next prime is 686138653. The reversal of 686138633 is 336831686.

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

It is a cyclic number.

It is not a de Polignac number, because 686138633 - 2¹⁸ = 685876489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686138653) 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 7 ways as a sum of consecutive naturals, for example, 292178 + ... + 294516.

It is an arithmetic number, because the mean of its divisors is an integer number (86240700).

Almost surely, 2^686138633 is an apocalyptic number.

It is an amenable number.

686138633 is a deficient number, since it is larger than the sum of its proper divisors (3786967).

686138633 is a wasteful number, since it uses less digits than its factorization.

686138633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3831.

The product of its digits is 373248, while the sum is 44.

The square root of 686138633 is about 26194.2480899911. The cubic root of 686138633 is about 882.0041413448.

The spelling of 686138633 in words is "six hundred eighty-six million, one hundred thirty-eight thousand, six hundred thirty-three".