646425798 has 8 divisors (see below), whose sum is σ = 1292851608. Its totient is φ = 215475264.

The previous prime is 646425797. The next prime is 646425817. The reversal of 646425798 is 897524646.

646425798 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

646425798 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 646425798.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646425797) 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, 53868811 + ... + 53868822.

It is an arithmetic number, because the mean of its divisors is an integer number (161606451).

Almost surely, 2^646425798 is an apocalyptic number.

646425798 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

646425798 is a wasteful number, since it uses less digits than its factorization.

646425798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107737638.

The product of its digits is 2903040, while the sum is 51.

The square root of 646425798 is about 25424.9050735691. The cubic root of 646425798 is about 864.6484356568.

The spelling of 646425798 in words is "six hundred forty-six million, four hundred twenty-five thousand, seven hundred ninety-eight".