646953400 has 24 divisors (see below), whose sum is σ = 1504167120. Its totient is φ = 258781280.

The previous prime is 646953397. The next prime is 646953409. The reversal of 646953400 is 4359646.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 646953400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646953409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1617184 + ... + 1617583.

It is an arithmetic number, because the mean of its divisors is an integer number (62673630).

Almost surely, 2^646953400 is an apocalyptic number.

It is an amenable number.

646953400 is an abundant number, since it is smaller than the sum of its proper divisors (857213720).

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

646953400 is a wasteful number, since it uses less digits than its factorization.

646953400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3234783 (or 3234774 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 646953400 is about 25435.2786499382. The cubic root of 646953400 is about 864.8836089177.

The spelling of 646953400 in words is "six hundred forty-six million, nine hundred fifty-three thousand, four hundred".