646894875 has 32 divisors (see below), whose sum is σ = 1174298112. Its totient is φ = 313644000.

The previous prime is 646894873. The next prime is 646894879. The reversal of 646894875 is 578498646.

It is not a de Polignac number, because 646894875 - 2¹ = 646894873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (646894873) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74287 + ... + 82536.

It is an arithmetic number, because the mean of its divisors is an integer number (36696816).

Almost surely, 2^646894875 is an apocalyptic number.

646894875 is a deficient number, since it is larger than the sum of its proper divisors (527403237).

646894875 is a wasteful number, since it uses less digits than its factorization.

646894875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156852 (or 156842 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 57.

The square root of 646894875 is about 25434.1281549024. The cubic root of 646894875 is about 864.8575282966.

The spelling of 646894875 in words is "six hundred forty-six million, eight hundred ninety-four thousand, eight hundred seventy-five".