6985617840 has 60 divisors (see below), whose sum is σ = 23460035664. Its totient is φ = 1862831232.

The previous prime is 6985617811. The next prime is 6985617887. The reversal of 6985617840 is 487165896.

6985617840 is a `hidden beast` number, since 6 + 9 + 8 + 561 + 78 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (60).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4850404 + ... + 4851843.

Almost surely, 2^6985617840 is an apocalyptic number.

6985617840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6985617840 is an abundant number, since it is smaller than the sum of its proper divisors (16474417824).

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

6985617840 is a wasteful number, since it uses less digits than its factorization.

6985617840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9702266 (or 9702257 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The square root of 6985617840 is about 83580.0086145006. The cubic root of 6985617840 is about 1911.6201853471.

The spelling of 6985617840 in words is "six billion, nine hundred eighty-five million, six hundred seventeen thousand, eight hundred forty".