686642435 has 4 divisors (see below), whose sum is σ = 823970928. Its totient is φ = 549313944.

The previous prime is 686642431. The next prime is 686642449. The reversal of 686642435 is 534246686.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 686642435 - 2² = 686642431 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686642431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68664239 + ... + 68664248.

It is an arithmetic number, because the mean of its divisors is an integer number (205992732).

Almost surely, 2^686642435 is an apocalyptic number.

686642435 is a deficient number, since it is larger than the sum of its proper divisors (137328493).

686642435 is a wasteful number, since it uses less digits than its factorization.

686642435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137328492.

The product of its digits is 829440, while the sum is 44.

The square root of 686642435 is about 26203.8629785763. The cubic root of 686642435 is about 882.2199610623.

The spelling of 686642435 in words is "six hundred eighty-six million, six hundred forty-two thousand, four hundred thirty-five".