684506840 has 32 divisors (see below), whose sum is σ = 1563133680. Its totient is φ = 269715072.

The previous prime is 684506813. The next prime is 684506843. The reversal of 684506840 is 48605486.

It is a super-2 number, since 2×684506840² = 937099228013571200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684506843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125027 + ... + 130386.

Almost surely, 2^684506840 is an apocalyptic number.

It is an amenable number.

684506840 is an abundant number, since it is smaller than the sum of its proper divisors (878626840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

684506840 is a wasteful number, since it uses less digits than its factorization.

684506840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255491 (or 255487 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 41.

The square root of 684506840 is about 26163.0816227752. The cubic root of 684506840 is about 881.3043844847.

The spelling of 684506840 in words is "six hundred eighty-four million, five hundred six thousand, eight hundred forty".