646956036 has 18 divisors (see below), whose sum is σ = 1635361182. Its totient is φ = 215652000.

The previous prime is 646956017. The next prime is 646956049. The reversal of 646956036 is 630659646.

It can be written as a sum of positive squares in only one way, i.e., 598095936 + 48860100 = 24456^2 + 6990^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×646956036² = 837104225033666592, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 646955982 and 646956000.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8985465 + ... + 8985536.

It is an arithmetic number, because the mean of its divisors is an integer number (90853399).

Almost surely, 2^646956036 is an apocalyptic number.

It is an amenable number.

646956036 is an abundant number, since it is smaller than the sum of its proper divisors (988405146).

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

646956036 is a wasteful number, since it uses less digits than its factorization.

646956036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17971011 (or 17971006 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 45.

The square root of 646956036 is about 25435.3304676782. The cubic root of 646956036 is about 864.8847835670.

The spelling of 646956036 in words is "six hundred forty-six million, nine hundred fifty-six thousand, thirty-six".