646398575 has 24 divisors (see below), whose sum is σ = 831510768. Its totient is φ = 498113280.

The previous prime is 646398569. The next prime is 646398581. The reversal of 646398575 is 575893646.

646398575 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (646398569) and next prime (646398581).

It is not a de Polignac number, because 646398575 - 2¹⁰ = 646397551 is a prime.

It is a super-2 number, since 2×646398575² = 835662235524061250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74357 + ... + 82593.

It is an arithmetic number, because the mean of its divisors is an integer number (34646282).

Almost surely, 2^646398575 is an apocalyptic number.

646398575 is a deficient number, since it is larger than the sum of its proper divisors (185112193).

646398575 is a wasteful number, since it uses less digits than its factorization.

646398575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8363 (or 8358 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 53.

The square root of 646398575 is about 25424.3697070350. The cubic root of 646398575 is about 864.6362978085.

The spelling of 646398575 in words is "six hundred forty-six million, three hundred ninety-eight thousand, five hundred seventy-five".