646862840352 has 60 divisors (see below), whose sum is σ = 1902405652686. Its totient is φ = 215620945920.

The previous prime is 646862840341. The next prime is 646862840357. The reversal of 646862840352 is 253048268646.

It is a happy number.

646862840352 is a `hidden beast` number, since 6 + 4 + 6 + 8 + 6 + 284 + 0 + 352 = 666.

It can be written as a sum of positive squares in only one way, i.e., 594126473616 + 52736366736 = 770796^2 + 229644^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (646862840357) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 124778049 + ... + 124783232.

Almost surely, 2^646862840352 is an apocalyptic number.

It is an amenable number.

646862840352 is an abundant number, since it is smaller than the sum of its proper divisors (1255542812334).

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

646862840352 is a wasteful number, since it uses less digits than its factorization.

646862840352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249561303 (or 249561286 counting only the distinct ones).

The product of its (nonzero) digits is 13271040, while the sum is 54.

The spelling of 646862840352 in words is "six hundred forty-six billion, eight hundred sixty-two million, eight hundred forty thousand, three hundred fifty-two".