646423000 has 32 divisors (see below), whose sum is σ = 1512632160. Its totient is φ = 258568800.

The previous prime is 646422991. The next prime is 646423009. The reversal of 646423000 is 324646.

It is an interprime number because it is at equal distance from previous prime (646422991) and next prime (646423009).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646423009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 322212 + ... + 324211.

It is an arithmetic number, because the mean of its divisors is an integer number (47269755).

Almost surely, 2^646423000 is an apocalyptic number.

It is an amenable number.

646423000 is an abundant number, since it is smaller than the sum of its proper divisors (866209160).

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

646423000 is a wasteful number, since it uses less digits than its factorization.

646423000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646444 (or 646430 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 646423000 is about 25424.8500487220. The cubic root of 646423000 is about 864.6471881355.

Adding to 646423000 its reverse (324646), we get a palindrome (646747646).

The spelling of 646423000 in words is "six hundred forty-six million, four hundred twenty-three thousand".