646804704 has 192 divisors, whose sum is σ = 2133734400. Its totient is φ = 170472960.

The previous prime is 646804703. The next prime is 646804721. The reversal of 646804704 is 407408646.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646804703) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 427309 + ... + 428819.

It is an arithmetic number, because the mean of its divisors is an integer number (11113200).

Almost surely, 2^646804704 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646804704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1066867200).

646804704 is an abundant number, since it is smaller than the sum of its proper divisors (1486929696).

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

646804704 is a wasteful number, since it uses less digits than its factorization.

646804704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1558 (or 1536 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 39.

The square root of 646804704 is about 25432.3554552071. The cubic root of 646804704 is about 864.8173421216.

The spelling of 646804704 in words is "six hundred forty-six million, eight hundred four thousand, seven hundred four".