646380612 has 18 divisors (see below), whose sum is σ = 1633906638. Its totient is φ = 215460192.

The previous prime is 646380611. The next prime is 646380629. The reversal of 646380612 is 216083646.

646380612 is a `hidden beast` number, since 6 + 4 + 6 + 38 + 0 + 612 = 666.

It can be written as a sum of positive squares in only one way, i.e., 403768836 + 242611776 = 20094^2 + 15576^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 17955017 = 646380612 / (6 + 4 + 6 + 3 + 8 + 0 + 6 + 1 + 2).

It is not an unprimeable number, because it can be changed into a prime (646380611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8977473 + ... + 8977544.

It is an arithmetic number, because the mean of its divisors is an integer number (90772591).

Almost surely, 2^646380612 is an apocalyptic number.

It is an amenable number.

646380612 is an abundant number, since it is smaller than the sum of its proper divisors (987526026).

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

646380612 is a wasteful number, since it uses less digits than its factorization.

646380612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17955027 (or 17955022 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 646380612 is about 25424.0164411526. The cubic root of 646380612 is about 864.6282885058.

It can be divided in two parts, 64 and 6380612, that added together give a square (6380676 = 2526²).

The spelling of 646380612 in words is "six hundred forty-six million, three hundred eighty thousand, six hundred twelve".