686620337 has 4 divisors (see below), whose sum is σ = 739437300. Its totient is φ = 633803376.

The previous prime is 686620307. The next prime is 686620343. The reversal of 686620337 is 733026686.

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

It can be written as a sum of positive squares in 2 ways, for example, as 216207616 + 470412721 = 14704^2 + 21689^2 .

It is a cyclic number.

It is not a de Polignac number, because 686620337 - 2⁶ = 686620273 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 686620294 and 686620303.

It is not an unprimeable number, because it can be changed into a prime (686620307) 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, 26408462 + ... + 26408487.

It is an arithmetic number, because the mean of its divisors is an integer number (184859325).

Almost surely, 2^686620337 is an apocalyptic number.

It is an amenable number.

686620337 is a deficient number, since it is larger than the sum of its proper divisors (52816963).

686620337 is a wasteful number, since it uses less digits than its factorization.

686620337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52816962.

The product of its (nonzero) digits is 217728, while the sum is 41.

The square root of 686620337 is about 26203.4413197961. The cubic root of 686620337 is about 882.2104968905.

The spelling of 686620337 in words is "six hundred eighty-six million, six hundred twenty thousand, three hundred thirty-seven".