646505646 has 32 divisors (see below), whose sum is σ = 1325386368. Its totient is φ = 210170400.

The previous prime is 646505641. The next prime is 646505653.

It is a happy number.

646505646 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 646505598 and 646505607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646505641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32641 + ... + 48563.

It is an arithmetic number, because the mean of its divisors is an integer number (41418324).

Almost surely, 2^646505646 is an apocalyptic number.

646505646 is an abundant number, since it is smaller than the sum of its proper divisors (678880722).

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

646505646 is a wasteful number, since it uses less digits than its factorization.

646505646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16096.

The product of its (nonzero) digits is 518400, while the sum is 42.

The square root of 646505646 is about 25426.4752964307. The cubic root of 646505646 is about 864.6840353116.

The spelling of 646505646 in words is "six hundred forty-six million, five hundred five thousand, six hundred forty-six".