684596957 has 4 divisors (see below), whose sum is σ = 746833056. Its totient is φ = 622360860.

The previous prime is 684596951. The next prime is 684596959. The reversal of 684596957 is 759695486.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 684596957 - 2²⁰ = 683548381 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 684596896 and 684596905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684596951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31118033 + ... + 31118054.

It is an arithmetic number, because the mean of its divisors is an integer number (186708264).

Almost surely, 2^684596957 is an apocalyptic number.

It is an amenable number.

684596957 is a deficient number, since it is larger than the sum of its proper divisors (62236099).

684596957 is a wasteful number, since it uses less digits than its factorization.

684596957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62236098.

The product of its digits is 16329600, while the sum is 59.

The square root of 684596957 is about 26164.8037829448. The cubic root of 684596957 is about 881.3430580803.

The spelling of 684596957 in words is "six hundred eighty-four million, five hundred ninety-six thousand, nine hundred fifty-seven".