646369946 has 8 divisors (see below), whose sum is σ = 995759220. Its totient is φ = 314450208.

The previous prime is 646369939. The next prime is 646369979. The reversal of 646369946 is 649963646.

It can be written as a sum of positive squares in 2 ways, for example, as 438693025 + 207676921 = 20945^2 + 14411^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4367291 + ... + 4367438.

Almost surely, 2^646369946 is an apocalyptic number.

646369946 is a deficient number, since it is larger than the sum of its proper divisors (349389274).

646369946 is a wasteful number, since it uses less digits than its factorization.

646369946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8734768.

The product of its digits is 5038848, while the sum is 53.

The square root of 646369946 is about 25423.8066779938. The cubic root of 646369946 is about 864.6235327030.

The spelling of 646369946 in words is "six hundred forty-six million, three hundred sixty-nine thousand, nine hundred forty-six".