684736874640 has 240 divisors, whose sum is σ = 2830246019328. Its totient is φ = 144471942144.

The previous prime is 684736874623. The next prime is 684736874683. The reversal of 684736874640 is 46478637486.

It is a happy number.

684736874640 is a `hidden beast` number, since 6 + 8 + 473 + 6 + 87 + 46 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5159884 + ... + 5290923.

Almost surely, 2^684736874640 is an apocalyptic number.

684736874640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

684736874640 is an abundant number, since it is smaller than the sum of its proper divisors (2145509144688).

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

684736874640 is a wasteful number, since it uses less digits than its factorization.

684736874640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10450846 (or 10450837 counting only the distinct ones).

The product of its (nonzero) digits is 130056192, while the sum is 63.

The spelling of 684736874640 in words is "six hundred eighty-four billion, seven hundred thirty-six million, eight hundred seventy-four thousand, six hundred forty".