648442867 has 4 divisors (see below), whose sum is σ = 657325720. Its totient is φ = 639560016.

The previous prime is 648442843. The next prime is 648442889. The reversal of 648442867 is 768244846.

It is a happy number.

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-648442867 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 648442867.

It is not an unprimeable number, because it can be changed into a prime (648442807) 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, 4441317 + ... + 4441462.

It is an arithmetic number, because the mean of its divisors is an integer number (164331430).

Almost surely, 2^648442867 is an apocalyptic number.

648442867 is a deficient number, since it is larger than the sum of its proper divisors (8882853).

648442867 is an equidigital number, since it uses as much as digits as its factorization.

648442867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8882852.

The product of its digits is 2064384, while the sum is 49.

The square root of 648442867 is about 25464.5413663785. The cubic root of 648442867 is about 865.5468345568.

The spelling of 648442867 in words is "six hundred forty-eight million, four hundred forty-two thousand, eight hundred sixty-seven".