6863817840 has 80 divisors (see below), whose sum is σ = 23212192896. Its totient is φ = 1663955200.

The previous prime is 6863817809. The next prime is 6863817859. The reversal of 6863817840 is 487183686.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×6863817840² = 94223990681404531200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1297326 + ... + 1302605.

Almost surely, 2^6863817840 is an apocalyptic number.

6863817840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6863817840 is an abundant number, since it is smaller than the sum of its proper divisors (16348375056).

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

6863817840 is a wasteful number, since it uses less digits than its factorization.

6863817840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2599958 (or 2599952 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 51.

The square root of 6863817840 is about 82848.1613555787. The cubic root of 6863817840 is about 1900.4447564547. Note that the first 3 decimals are identical.

The spelling of 6863817840 in words is "six billion, eight hundred sixty-three million, eight hundred seventeen thousand, eight hundred forty".