6840621805 has 8 divisors (see below), whose sum is σ = 8212165344. Its totient is φ = 5470218000.

The previous prime is 6840621779. The next prime is 6840621833. The reversal of 6840621805 is 5081260486.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6840621805 - 2⁵ = 6840621773 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 271671 + ... + 295780.

It is an arithmetic number, because the mean of its divisors is an integer number (1026520668).

Almost surely, 2^6840621805 is an apocalyptic number.

It is an amenable number.

6840621805 is a deficient number, since it is larger than the sum of its proper divisors (1371543539).

6840621805 is a wasteful number, since it uses less digits than its factorization.

6840621805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569867.

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 6840621805 is about 82708.0516334413. The cubic root of 6840621805 is about 1898.3015111887.

The spelling of 6840621805 in words is "six billion, eight hundred forty million, six hundred twenty-one thousand, eight hundred five".