646010780 has 24 divisors (see below), whose sum is σ = 1366984080. Its totient is φ = 256430720.

The previous prime is 646010779. The next prime is 646010789. The reversal of 646010780 is 87010646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646010789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120665 + ... + 125904.

It is an arithmetic number, because the mean of its divisors is an integer number (56957670).

Almost surely, 2^646010780 is an apocalyptic number.

It is an amenable number.

646010780 is an abundant number, since it is smaller than the sum of its proper divisors (720973300).

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

646010780 is a wasteful number, since it uses less digits than its factorization.

646010780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246709 (or 246707 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 646010780 is about 25416.7421201066. The cubic root of 646010780 is about 864.4633556430.

The spelling of 646010780 in words is "six hundred forty-six million, ten thousand, seven hundred eighty".