648197747 has 8 divisors (see below), whose sum is σ = 657144096. Its totient is φ = 639297792.

The previous prime is 648197729. The next prime is 648197779. The reversal of 648197747 is 747791846.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648197747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (648497747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17018 + ... + 39824.

It is an arithmetic number, because the mean of its divisors is an integer number (82143012).

Almost surely, 2^648197747 is an apocalyptic number.

648197747 is a deficient number, since it is larger than the sum of its proper divisors (8946349).

648197747 is a wasteful number, since it uses less digits than its factorization.

648197747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23197.

The product of its digits is 2370816, while the sum is 53.

The square root of 648197747 is about 25459.7279443438. The cubic root of 648197747 is about 865.4377580856.

The spelling of 648197747 in words is "six hundred forty-eight million, one hundred ninety-seven thousand, seven hundred forty-seven".