646900544 has 56 divisors (see below), whose sum is σ = 1325453280. Its totient is φ = 313099776.

The previous prime is 646900531. The next prime is 646900561. The reversal of 646900544 is 445009646.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 646900498 and 646900507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 251714 + ... + 254270.

Almost surely, 2^646900544 is an apocalyptic number.

646900544 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646900544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (662726640).

646900544 is an abundant number, since it is smaller than the sum of its proper divisors (678552736).

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

646900544 is a wasteful number, since it uses less digits than its factorization.

646900544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2695 (or 2685 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 646900544 is about 25434.2395994062. The cubic root of 646900544 is about 864.8600546540.

The spelling of 646900544 in words is "six hundred forty-six million, nine hundred thousand, five hundred forty-four".