646220601 has 48 divisors (see below), whose sum is σ = 1054544400. Its totient is φ = 378556416.

The previous prime is 646220563. The next prime is 646220611. The reversal of 646220601 is 106022646.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 16160400 + 630060201 = 4020^2 + 25101^2 .

It is not a de Polignac number, because 646220601 - 2⁶ = 646220537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (646220611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 246385 + ... + 248993.

It is an arithmetic number, because the mean of its divisors is an integer number (21969675).

Almost surely, 2^646220601 is an apocalyptic number.

It is an amenable number.

646220601 is a deficient number, since it is larger than the sum of its proper divisors (408323799).

646220601 is a wasteful number, since it uses less digits than its factorization.

646220601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2730 (or 2727 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 646220601 is about 25420.8693989800. The cubic root of 646220601 is about 864.5569366055.

The spelling of 646220601 in words is "six hundred forty-six million, two hundred twenty thousand, six hundred one".