646155236 has 12 divisors (see below), whose sum is σ = 1147649328. Its totient is φ = 318255432.

The previous prime is 646155229. The next prime is 646155241. The reversal of 646155236 is 632551646.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 646155236.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1205246 + ... + 1205781.

It is an arithmetic number, because the mean of its divisors is an integer number (95637444).

Almost surely, 2^646155236 is an apocalyptic number.

It is an amenable number.

646155236 is a deficient number, since it is larger than the sum of its proper divisors (501494092).

646155236 is a wasteful number, since it uses less digits than its factorization.

646155236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2411098 (or 2411096 counting only the distinct ones).

The product of its digits is 129600, while the sum is 38.

The square root of 646155236 is about 25419.5837102027. The cubic root of 646155236 is about 864.5277857400.

The spelling of 646155236 in words is "six hundred forty-six million, one hundred fifty-five thousand, two hundred thirty-six".