646149336 has 32 divisors (see below), whose sum is σ = 1846141440. Its totient is φ = 184614048.

The previous prime is 646149307. The next prime is 646149349. The reversal of 646149336 is 633941646.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1922896 + ... + 1923231.

It is an arithmetic number, because the mean of its divisors is an integer number (57691920).

Almost surely, 2^646149336 is an apocalyptic number.

It is an amenable number.

646149336 is an abundant number, since it is smaller than the sum of its proper divisors (1199992104).

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

646149336 is a wasteful number, since it uses less digits than its factorization.

646149336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3846143 (or 3846139 counting only the distinct ones).

The product of its digits is 279936, while the sum is 42.

The square root of 646149336 is about 25419.4676576832. The cubic root of 646149336 is about 864.5251544169.

The spelling of 646149336 in words is "six hundred forty-six million, one hundred forty-nine thousand, three hundred thirty-six".