6738780021 has 8 divisors (see below), whose sum is σ = 8999557920. Its totient is φ = 4485261072.

The previous prime is 6738780019. The next prime is 6738780077. The reversal of 6738780021 is 1200878376.

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

It is not a de Polignac number, because 6738780021 - 2¹ = 6738780019 is a prime.

It is a super-2 number, since 2×6738780021² = 90822312342857520882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6738780001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1812570 + ... + 1816283.

It is an arithmetic number, because the mean of its divisors is an integer number (1124944740).

Almost surely, 2^6738780021 is an apocalyptic number.

It is an amenable number.

6738780021 is a deficient number, since it is larger than the sum of its proper divisors (2260777899).

6738780021 is a wasteful number, since it uses less digits than its factorization.

6738780021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3629475.

The product of its (nonzero) digits is 112896, while the sum is 42.

The square root of 6738780021 is about 82090.0726092991. The cubic root of 6738780021 is about 1888.8338616943.

The spelling of 6738780021 in words is "six billion, seven hundred thirty-eight million, seven hundred eighty thousand, twenty-one".