684039040 has 32 divisors (see below), whose sum is σ = 1635282360. Its totient is φ = 273615360.

The previous prime is 684039029. The next prime is 684039061. The reversal of 684039040 is 40930486.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 684038987 and 684039005.

It is a congruent number.

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, 533766 + ... + 535045.

Almost surely, 2^684039040 is an apocalyptic number.

It is an amenable number.

684039040 is an abundant number, since it is smaller than the sum of its proper divisors (951243320).

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

684039040 is a wasteful number, since it uses less digits than its factorization.

684039040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068830 (or 1068818 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 684039040 is about 26154.1400164486. The cubic root of 684039040 is about 881.1035741493.

The spelling of 684039040 in words is "six hundred eighty-four million, thirty-nine thousand, forty".