646235316 has 18 divisors (see below), whose sum is σ = 1633539362. Its totient is φ = 215411760.

The previous prime is 646235279. The next prime is 646235329. The reversal of 646235316 is 613532646.

646235316 is a `hidden beast` number, since 64 + 62 + 3 + 531 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 644144400 + 2090916 = 25380^2 + 1446^2 .

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: 17950981 = 646235316 / (6 + 4 + 6 + 2 + 3 + 5 + 3 + 1 + 6).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8975455 + ... + 8975526.

Almost surely, 2^646235316 is an apocalyptic number.

It is an amenable number.

646235316 is an abundant number, since it is smaller than the sum of its proper divisors (987304046).

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

646235316 is a wasteful number, since it uses less digits than its factorization.

646235316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17950991 (or 17950986 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

The square root of 646235316 is about 25421.1588248844. The cubic root of 646235316 is about 864.5634987912.

The spelling of 646235316 in words is "six hundred forty-six million, two hundred thirty-five thousand, three hundred sixteen".