646804027 has 4 divisors (see below), whose sum is σ = 649510560. Its totient is φ = 644097496.

The previous prime is 646804021. The next prime is 646804031. The reversal of 646804027 is 720408646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 720408646 = 2 ⋅360204323.

It is a cyclic number.

It is not a de Polignac number, because 646804027 - 2³ = 646804019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646804021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1352908 + ... + 1353385.

It is an arithmetic number, because the mean of its divisors is an integer number (162377640).

Almost surely, 2^646804027 is an apocalyptic number.

646804027 is a deficient number, since it is larger than the sum of its proper divisors (2706533).

646804027 is a wasteful number, since it uses less digits than its factorization.

646804027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2706532.

The product of its (nonzero) digits is 64512, while the sum is 37.

The square root of 646804027 is about 25432.3421453865. The cubic root of 646804027 is about 864.8170403914.

The spelling of 646804027 in words is "six hundred forty-six million, eight hundred four thousand, twenty-seven".