646380610 has 8 divisors (see below), whose sum is σ = 1163485116. Its totient is φ = 258552240.

The previous prime is 646380571. The next prime is 646380611. The reversal of 646380610 is 16083646.

It can be written as a sum of positive squares in 2 ways, for example, as 624450121 + 21930489 = 24989^2 + 4683^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 32319021 + ... + 32319040.

Almost surely, 2^646380610 is an apocalyptic number.

646380610 is a deficient number, since it is larger than the sum of its proper divisors (517104506).

646380610 is a wasteful number, since it uses less digits than its factorization.

646380610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64638068.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 646380610 is about 25424.0164018198. The cubic root of 646380610 is about 864.6282876140.

The spelling of 646380610 in words is "six hundred forty-six million, three hundred eighty thousand, six hundred ten".