646450 has 24 divisors (see below), whose sum is σ = 1374912. Its totient is φ = 221520.

The previous prime is 646433. The next prime is 646453. The reversal of 646450 is 54646.

646450 = T₉₂ + T₉₃ + ... + T₁₆₆.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (646453) 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 11 ways as a sum of consecutive naturals, for example, 574 + ... + 1273.

It is an arithmetic number, because the mean of its divisors is an integer number (57288).

2⁶⁴⁶⁴⁵⁰ is an apocalyptic number.

646450 is an abundant number, since it is smaller than the sum of its proper divisors (728462).

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

646450 is a wasteful number, since it uses less digits than its factorization.

646450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1866 (or 1861 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 646450 is about 804.0211440006. The cubic root of 646450 is about 86.4659226254.

The spelling of 646450 in words is "six hundred forty-six thousand, four hundred fifty".