646321434 has 32 divisors (see below), whose sum is σ = 1458786240. Its totient is φ = 189100800.

The previous prime is 646321399. The next prime is 646321441. The reversal of 646321434 is 434123646.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 646321395 and 646321404.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166927 + ... + 170754.

It is an arithmetic number, because the mean of its divisors is an integer number (45587070).

Almost surely, 2^646321434 is an apocalyptic number.

646321434 is an abundant number, since it is smaller than the sum of its proper divisors (812464806).

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

646321434 is a wasteful number, since it uses less digits than its factorization.

646321434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337726.

The product of its digits is 41472, while the sum is 33.

The square root of 646321434 is about 25422.8525936804. The cubic root of 646321434 is about 864.6019013001.

It can be divided in two parts, 64632 and 1434, that added together give a palindrome (66066).

The spelling of 646321434 in words is "six hundred forty-six million, three hundred twenty-one thousand, four hundred thirty-four".