646827394 has 8 divisors (see below), whose sum is σ = 970366860. Its totient is φ = 323371776.

The previous prime is 646827361. The next prime is 646827487. The reversal of 646827394 is 493728646.

It can be written as a sum of positive squares in 2 ways, for example, as 552485025 + 94342369 = 23505^2 + 9713^2 .

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, 4522 + ... + 36250.

Almost surely, 2^646827394 is an apocalyptic number.

646827394 is a deficient number, since it is larger than the sum of its proper divisors (323539466).

646827394 is a wasteful number, since it uses less digits than its factorization.

646827394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41924.

The product of its digits is 1741824, while the sum is 49.

The square root of 646827394 is about 25432.8015365984. The cubic root of 646827394 is about 864.8274546413.

The spelling of 646827394 in words is "six hundred forty-six million, eight hundred twenty-seven thousand, three hundred ninety-four".