646987068 has 96 divisors (see below), whose sum is σ = 2064491520. Its totient is φ = 170631360.

The previous prime is 646987063. The next prime is 646987111. The reversal of 646987068 is 860789646.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646987063) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23088 + ... + 42743.

It is an arithmetic number, because the mean of its divisors is an integer number (21505120).

Almost surely, 2^646987068 is an apocalyptic number.

It is an amenable number.

646987068 is an abundant number, since it is smaller than the sum of its proper divisors (1417504452).

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

646987068 is a wasteful number, since it uses less digits than its factorization.

646987068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65864 (or 65856 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 54.

The square root of 646987068 is about 25435.9404779929. The cubic root of 646987068 is about 864.8986117480.

The spelling of 646987068 in words is "six hundred forty-six million, nine hundred eighty-seven thousand, sixty-eight".