646941375 has 48 divisors (see below), whose sum is σ = 1234857312. Its totient is φ = 324729600.

The previous prime is 646941353. The next prime is 646941377. The reversal of 646941375 is 573149646.

It is not a de Polignac number, because 646941375 - 2⁶ = 646941311 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 646941375.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646941377) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2212 + ... + 36038.

It is an arithmetic number, because the mean of its divisors is an integer number (25726194).

Almost surely, 2^646941375 is an apocalyptic number.

646941375 is a deficient number, since it is larger than the sum of its proper divisors (587915937).

646941375 is a wasteful number, since it uses less digits than its factorization.

646941375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33865 (or 33852 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The square root of 646941375 is about 25435.0422645609. The cubic root of 646941375 is about 864.8782503196.

The spelling of 646941375 in words is "six hundred forty-six million, nine hundred forty-one thousand, three hundred seventy-five".