6421062644 has 12 divisors (see below), whose sum is σ = 11510929668. Its totient is φ = 3132225600.

The previous prime is 6421062631. The next prime is 6421062649. The reversal of 6421062644 is 4462601246.

It can be written as a sum of positive squares in 2 ways, for example, as 82992100 + 6338070544 = 9110^2 + 79612^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6421062649) 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, 19576247 + ... + 19576574.

It is an arithmetic number, because the mean of its divisors is an integer number (959244139).

Almost surely, 2^6421062644 is an apocalyptic number.

It is an amenable number.

6421062644 is a deficient number, since it is larger than the sum of its proper divisors (5089867024).

6421062644 is a wasteful number, since it uses less digits than its factorization.

6421062644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39152866 (or 39152864 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 35.

The square root of 6421062644 is about 80131.5333935399. The cubic root of 6421062644 is about 1858.6700559526.

The spelling of 6421062644 in words is "six billion, four hundred twenty-one million, sixty-two thousand, six hundred forty-four".