646038580 has 24 divisors (see below), whose sum is σ = 1480016160. Its totient is φ = 234923040.

The previous prime is 646038577. The next prime is 646038581. The reversal of 646038580 is 85830646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646038581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1468050 + ... + 1468489.

It is an arithmetic number, because the mean of its divisors is an integer number (61667340).

Almost surely, 2^646038580 is an apocalyptic number.

It is an amenable number.

646038580 is an abundant number, since it is smaller than the sum of its proper divisors (833977580).

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

646038580 is a wasteful number, since it uses less digits than its factorization.

646038580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2936559 (or 2936557 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 646038580 is about 25417.2889978455. The cubic root of 646038580 is about 864.4757557129.

The spelling of 646038580 in words is "six hundred forty-six million, thirty-eight thousand, five hundred eighty".