620646221 has 8 divisors (see below), whose sum is σ = 668603040. Its totient is φ = 572720112.

The previous prime is 620646211. The next prime is 620646223. The reversal of 620646221 is 122646026.

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 620646221 - 2⁶ = 620646157 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 (620646223) 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, 50906 + ... + 61908.

It is an arithmetic number, because the mean of its divisors is an integer number (83575380).

Almost surely, 2^620646221 is an apocalyptic number.

It is an amenable number.

620646221 is a deficient number, since it is larger than the sum of its proper divisors (47956819).

620646221 is a wasteful number, since it uses less digits than its factorization.

620646221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15355.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 620646221 is about 24912.7722463800. The cubic root of 620646221 is about 852.9980502304.

The spelling of 620646221 in words is "six hundred twenty million, six hundred forty-six thousand, two hundred twenty-one".