686623433 has 16 divisors (see below), whose sum is σ = 728082432. Its totient is φ = 646464000.

The previous prime is 686623411. The next prime is 686623451. The reversal of 686623433 is 334326686.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 686623433 - 2²² = 682429129 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (686623403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 753248 + ... + 754158.

It is an arithmetic number, because the mean of its divisors is an integer number (45505152).

Almost surely, 2^686623433 is an apocalyptic number.

It is an amenable number.

686623433 is a deficient number, since it is larger than the sum of its proper divisors (41458999).

686623433 is a wasteful number, since it uses less digits than its factorization.

686623433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1576.

The product of its digits is 373248, while the sum is 41.

The square root of 686623433 is about 26203.5003959395. The cubic root of 686623433 is about 882.2118228633.

The spelling of 686623433 in words is "six hundred eighty-six million, six hundred twenty-three thousand, four hundred thirty-three".