646403347 has 4 divisors (see below), whose sum is σ = 646484080. Its totient is φ = 646322616.

The previous prime is 646403327. The next prime is 646403377. The reversal of 646403347 is 743304646.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646403347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646403327) 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, 26847 + ... + 44872.

It is an arithmetic number, because the mean of its divisors is an integer number (161621020).

Almost surely, 2^646403347 is an apocalyptic number.

646403347 is a deficient number, since it is larger than the sum of its proper divisors (80733).

646403347 is an equidigital number, since it uses as much as digits as its factorization.

646403347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80732.

The product of its (nonzero) digits is 145152, while the sum is 37.

The square root of 646403347 is about 25424.4635538294. The cubic root of 646403347 is about 864.6384255124.

The spelling of 646403347 in words is "six hundred forty-six million, four hundred three thousand, three hundred forty-seven".