684761828 has 12 divisors (see below), whose sum is σ = 1227561132. Its totient is φ = 334030080.

The previous prime is 684761813. The next prime is 684761867. The reversal of 684761828 is 828167486.

It can be written as a sum of positive squares in 2 ways, for example, as 253701184 + 431060644 = 15928^2 + 20762^2 .

It is a super-2 number, since 2×684761828² = 937797522171803168, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2087525 + ... + 2087852.

It is an arithmetic number, because the mean of its divisors is an integer number (102296761).

Almost surely, 2^684761828 is an apocalyptic number.

It is an amenable number.

684761828 is a deficient number, since it is larger than the sum of its proper divisors (542799304).

684761828 is a wasteful number, since it uses less digits than its factorization.

684761828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4175422 (or 4175420 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 50.

The square root of 684761828 is about 26167.9542188533. The cubic root of 684761828 is about 881.4138034761.

The spelling of 684761828 in words is "six hundred eighty-four million, seven hundred sixty-one thousand, eight hundred twenty-eight".