646262646 has 16 divisors (see below), whose sum is σ = 1327458864. Its totient is φ = 209598624.

The previous prime is 646262641. The next prime is 646262647.

646262646 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×646262646² = 835310815229842632, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 646262598 and 646262607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646262641) 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, 1455325 + ... + 1455768.

It is an arithmetic number, because the mean of its divisors is an integer number (82966179).

Almost surely, 2^646262646 is an apocalyptic number.

646262646 is an abundant number, since it is smaller than the sum of its proper divisors (681196218).

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

646262646 is a wasteful number, since it uses less digits than its factorization.

646262646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2911135.

The product of its digits is 497664, while the sum is 42.

The square root of 646262646 is about 25421.6963635396. The cubic root of 646262646 is about 864.5756863988.

The spelling of 646262646 in words is "six hundred forty-six million, two hundred sixty-two thousand, six hundred forty-six".