646426426 has 16 divisors (see below), whose sum is σ = 976752000. Its totient is φ = 320850288.

The previous prime is 646426421. The next prime is 646426433. The reversal of 646426426 is 624624646.

It is a super-2 number, since 2×646426426² = 835734248462266952, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (646426421) 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 7 ways as a sum of consecutive naturals, for example, 198580 + ... + 201808.

It is an arithmetic number, because the mean of its divisors is an integer number (61047000).

Almost surely, 2^646426426 is an apocalyptic number.

646426426 is a deficient number, since it is larger than the sum of its proper divisors (330325574).

646426426 is a wasteful number, since it uses less digits than its factorization.

646426426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3933.

The product of its digits is 331776, while the sum is 40.

The square root of 646426426 is about 25424.9174236614. The cubic root of 646426426 is about 864.6487156575.

The spelling of 646426426 in words is "six hundred forty-six million, four hundred twenty-six thousand, four hundred twenty-six".