648220621 has 8 divisors (see below), whose sum is σ = 657123264. Its totient is φ = 639344160.

The previous prime is 648220609. The next prime is 648220631. The reversal of 648220621 is 126022846.

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 648220621 - 2¹³ = 648212429 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 (648220631) 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, 46185 + ... + 58561.

It is an arithmetic number, because the mean of its divisors is an integer number (82140408).

Almost surely, 2^648220621 is an apocalyptic number.

It is an amenable number.

648220621 is a deficient number, since it is larger than the sum of its proper divisors (8902643).

648220621 is a wasteful number, since it uses less digits than its factorization.

648220621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13091.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 648220621 is about 25460.1771596350. The cubic root of 648220621 is about 865.4479379988.

The spelling of 648220621 in words is "six hundred forty-eight million, two hundred twenty thousand, six hundred twenty-one".