6827400721 has 4 divisors (see below), whose sum is σ = 6827829732. Its totient is φ = 6826971712.

The previous prime is 6827400709. The next prime is 6827400757. The reversal of 6827400721 is 1270047286.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5193220096 + 1634180625 = 72064^2 + 40425^2 .

It is a cyclic number.

It is not a de Polignac number, because 6827400721 - 2⁵ = 6827400689 is a prime.

It is a super-2 number, since 2×6827400721² = 93226801210222639682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6827400761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189676 + ... + 222781.

It is an arithmetic number, because the mean of its divisors is an integer number (1706957433).

Almost surely, 2^6827400721 is an apocalyptic number.

It is an amenable number.

6827400721 is a deficient number, since it is larger than the sum of its proper divisors (429011).

6827400721 is a wasteful number, since it uses less digits than its factorization.

6827400721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429010.

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 6827400721 is about 82628.0867562598. The cubic root of 6827400721 is about 1897.0777535240.

The spelling of 6827400721 in words is "six billion, eight hundred twenty-seven million, four hundred thousand, seven hundred twenty-one".