646867801 has 4 divisors (see below), whose sum is σ = 674992512. Its totient is φ = 618743092.

The previous prime is 646867747. The next prime is 646867807. The reversal of 646867801 is 108768646.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 646867801 - 2¹¹ = 646865753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646867807) 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, 14062321 + ... + 14062366.

It is an arithmetic number, because the mean of its divisors is an integer number (168748128).

Almost surely, 2^646867801 is an apocalyptic number.

It is an amenable number.

646867801 is a deficient number, since it is larger than the sum of its proper divisors (28124711).

646867801 is a wasteful number, since it uses less digits than its factorization.

646867801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28124710.

The product of its (nonzero) digits is 387072, while the sum is 46.

The square root of 646867801 is about 25433.5959117070. The cubic root of 646867801 is about 864.8454627198.

The spelling of 646867801 in words is "six hundred forty-six million, eight hundred sixty-seven thousand, eight hundred one".