684332757 has 12 divisors (see below), whose sum is σ = 991418220. Its totient is φ = 454866048.

The previous prime is 684332743. The next prime is 684332791. The reversal of 684332757 is 757233486.

It can be written as a sum of positive squares in 2 ways, for example, as 517380516 + 166952241 = 22746^2 + 12921^2 .

It is a de Polignac number, because none of the positive numbers 2^k-684332757 is a prime.

It is a super-2 number, since 2×684332757² = 936622644606442098, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684332717) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109782 + ... + 115847.

It is an arithmetic number, because the mean of its divisors is an integer number (82618185).

Almost surely, 2^684332757 is an apocalyptic number.

It is an amenable number.

684332757 is a deficient number, since it is larger than the sum of its proper divisors (307085463).

684332757 is a wasteful number, since it uses less digits than its factorization.

684332757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225972 (or 225969 counting only the distinct ones).

The product of its digits is 846720, while the sum is 45.

The square root of 684332757 is about 26159.7545286648. The cubic root of 684332757 is about 881.2296673745.

The spelling of 684332757 in words is "six hundred eighty-four million, three hundred thirty-two thousand, seven hundred fifty-seven".