646427136 has 40 divisors (see below), whose sum is σ = 1722126384. Its totient is φ = 215475200.

The previous prime is 646427123. The next prime is 646427137. The reversal of 646427136 is 631724646.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 646427094 and 646427103.

It is not an unprimeable number, because it can be changed into a prime (646427137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208890 + ... + 211961.

Almost surely, 2^646427136 is an apocalyptic number.

It is an amenable number.

646427136 is an abundant number, since it is smaller than the sum of its proper divisors (1075699248).

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

646427136 is an equidigital number, since it uses as much as digits as its factorization.

646427136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420872 (or 420856 counting only the distinct ones).

The product of its digits is 145152, while the sum is 39.

The square root of 646427136 is about 25424.9313863381. The cubic root of 646427136 is about 864.6490322186.

The spelling of 646427136 in words is "six hundred forty-six million, four hundred twenty-seven thousand, one hundred thirty-six".