684088240 has 40 divisors (see below), whose sum is σ = 1735098768. Its totient is φ = 248759040.

The previous prime is 684088193. The next prime is 684088267. The reversal of 684088240 is 42880486.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 684088193 and 684088202.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 387807 + ... + 389566.

Almost surely, 2^684088240 is an apocalyptic number.

It is an amenable number.

684088240 is an abundant number, since it is smaller than the sum of its proper divisors (1051010528).

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

684088240 is a wasteful number, since it uses less digits than its factorization.

684088240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777397 (or 777391 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 40.

The square root of 684088240 is about 26155.0805772034. The cubic root of 684088240 is about 881.1246983123.

The spelling of 684088240 in words is "six hundred eighty-four million, eighty-eight thousand, two hundred forty".