647030721 has 8 divisors (see below), whose sum is σ = 876850624. Its totient is φ = 424282320.

The previous prime is 647030719. The next prime is 647030723. The reversal of 647030721 is 127030746.

It is an interprime number because it is at equal distance from previous prime (647030719) and next prime (647030723).

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

It is not a de Polignac number, because 647030721 - 2¹ = 647030719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647030723) 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, 1767661 + ... + 1768026.

It is an arithmetic number, because the mean of its divisors is an integer number (109606328).

Almost surely, 2^647030721 is an apocalyptic number.

647030721 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

647030721 is a deficient number, since it is larger than the sum of its proper divisors (229819903).

647030721 is a wasteful number, since it uses less digits than its factorization.

647030721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3535751.

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 647030721 is about 25436.7985603535. The cubic root of 647030721 is about 864.9180632291.

The spelling of 647030721 in words is "six hundred forty-seven million, thirty thousand, seven hundred twenty-one".