646311768 has 32 divisors (see below), whose sum is σ = 1616414400. Its totient is φ = 215352608.

The previous prime is 646311761. The next prime is 646311769. The reversal of 646311768 is 867113646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646311761) 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, 99055 + ... + 105377.

It is an arithmetic number, because the mean of its divisors is an integer number (50512950).

Almost surely, 2^646311768 is an apocalyptic number.

It is an amenable number.

646311768 is an abundant number, since it is smaller than the sum of its proper divisors (970102632).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646311768 is a wasteful number, since it uses less digits than its factorization.

646311768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10591 (or 10587 counting only the distinct ones).

The product of its digits is 145152, while the sum is 42.

The square root of 646311768 is about 25422.6624884177. The cubic root of 646311768 is about 864.5975911209.

The spelling of 646311768 in words is "six hundred forty-six million, three hundred eleven thousand, seven hundred sixty-eight".