647368421 has 8 divisors (see below), whose sum is σ = 765361920. Its totient is φ = 535753008.

The previous prime is 647368409. The next prime is 647368433. The reversal of 647368421 is 124863746.

647368421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (647368409) and next prime (647368433).

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

It is not a de Polignac number, because 647368421 - 2¹⁰ = 647367397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647368471) 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, 1594301 + ... + 1594706.

It is an arithmetic number, because the mean of its divisors is an integer number (95670240).

Almost surely, 2^647368421 is an apocalyptic number.

It is an amenable number.

647368421 is a deficient number, since it is larger than the sum of its proper divisors (117993499).

647368421 is a wasteful number, since it uses less digits than its factorization.

647368421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3189043.

The product of its digits is 193536, while the sum is 41.

The square root of 647368421 is about 25443.4357153274. The cubic root of 647368421 is about 865.0685105058.

The spelling of 647368421 in words is "six hundred forty-seven million, three hundred sixty-eight thousand, four hundred twenty-one".