6420401647 has 8 divisors (see below), whose sum is σ = 7007691600. Its totient is φ = 5833714560.

The previous prime is 6420401639. The next prime is 6420401657. The reversal of 6420401647 is 7461040246.

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

It is a cyclic number.

It is not a de Polignac number, because 6420401647 - 2³ = 6420401639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6420401657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128298 + ... + 171175.

It is an arithmetic number, because the mean of its divisors is an integer number (875961450).

Almost surely, 2^6420401647 is an apocalyptic number.

6420401647 is a deficient number, since it is larger than the sum of its proper divisors (587289953).

6420401647 is a wasteful number, since it uses less digits than its factorization.

6420401647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301433.

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 6420401647 is about 80127.4088374259. The cubic root of 6420401647 is about 1858.6062753626.

The spelling of 6420401647 in words is "six billion, four hundred twenty million, four hundred one thousand, six hundred forty-seven".