646803860 has 12 divisors (see below), whose sum is σ = 1358288148. Its totient is φ = 258721536.

The previous prime is 646803853. The next prime is 646803869. The reversal of 646803860 is 68308646.

It can be written as a sum of positive squares in 2 ways, for example, as 451307536 + 195496324 = 21244^2 + 13982^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646803869) 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, 16170077 + ... + 16170116.

It is an arithmetic number, because the mean of its divisors is an integer number (113190679).

Almost surely, 2^646803860 is an apocalyptic number.

It is an amenable number.

646803860 is an abundant number, since it is smaller than the sum of its proper divisors (711484288).

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

646803860 is a wasteful number, since it uses less digits than its factorization.

646803860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32340202 (or 32340200 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 41.

The square root of 646803860 is about 25432.3388621652. The cubic root of 646803860 is about 864.8169659616.

The spelling of 646803860 in words is "six hundred forty-six million, eight hundred three thousand, eight hundred sixty".