646326826 has 4 divisors (see below), whose sum is σ = 969490242. Its totient is φ = 323163412.

The previous prime is 646326817. The next prime is 646326827. The reversal of 646326826 is 628623646.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 482461225 + 163865601 = 21965^2 + 12801^2 .

It is not an unprimeable number, because it can be changed into a prime (646326827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161581705 + ... + 161581708.

Almost surely, 2^646326826 is an apocalyptic number.

646326826 is a deficient number, since it is larger than the sum of its proper divisors (323163416).

646326826 is a wasteful number, since it uses less digits than its factorization.

646326826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323163415.

The product of its digits is 497664, while the sum is 43.

The square root of 646326826 is about 25422.9586397807. The cubic root of 646326826 is about 864.6043056355.

The spelling of 646326826 in words is "six hundred forty-six million, three hundred twenty-six thousand, eight hundred twenty-six".