646400627 has 4 divisors (see below), whose sum is σ = 646454976. Its totient is φ = 646346280.

The previous prime is 646400621. The next prime is 646400641. The reversal of 646400627 is 726004646.

It is a happy number.

646400627 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 726004646 = 2 ⋅363002323.

It is a cyclic number.

It is not a de Polignac number, because 646400627 - 2⁶ = 646400563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646400621) 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, 803 + ... + 35964.

It is an arithmetic number, because the mean of its divisors is an integer number (161613744).

Almost surely, 2^646400627 is an apocalyptic number.

646400627 is a deficient number, since it is larger than the sum of its proper divisors (54349).

646400627 is a wasteful number, since it uses less digits than its factorization.

646400627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54348.

The product of its (nonzero) digits is 48384, while the sum is 35.

The square root of 646400627 is about 25424.4100619857. The cubic root of 646400627 is about 864.6372127403.

The spelling of 646400627 in words is "six hundred forty-six million, four hundred thousand, six hundred twenty-seven".