647275321 has 8 divisors (see below), whose sum is σ = 806992704. Its totient is φ = 504370320.

The previous prime is 647275313. The next prime is 647275333. The reversal of 647275321 is 123572746.

It is a happy number.

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 647275321 - 2³ = 647275313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (647275021) 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, 4203010 + ... + 4203163.

It is an arithmetic number, because the mean of its divisors is an integer number (100874088).

Almost surely, 2^647275321 is an apocalyptic number.

It is an amenable number.

647275321 is a deficient number, since it is larger than the sum of its proper divisors (159717383).

647275321 is a wasteful number, since it uses less digits than its factorization.

647275321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8406191.

The product of its digits is 70560, while the sum is 37.

The square root of 647275321 is about 25441.6061010307. The cubic root of 647275321 is about 865.0270391494.

The spelling of 647275321 in words is "six hundred forty-seven million, two hundred seventy-five thousand, three hundred twenty-one".