648797731 has 8 divisors (see below), whose sum is σ = 712638720. Its totient is φ = 587926152.

The previous prime is 648797719. The next prime is 648797759. The reversal of 648797731 is 137797846.

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

It is a cyclic number.

It is not a de Polignac number, because 648797731 - 2¹³ = 648789539 is a prime.

It is a super-2 number, since 2×648797731² = 841876991501496722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (648797711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 741895 + ... + 742768.

It is an arithmetic number, because the mean of its divisors is an integer number (89079840).

Almost surely, 2^648797731 is an apocalyptic number.

648797731 is a deficient number, since it is larger than the sum of its proper divisors (63840989).

648797731 is a wasteful number, since it uses less digits than its factorization.

648797731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1484705.

The product of its digits is 1778112, while the sum is 52.

The square root of 648797731 is about 25471.5082199700. The cubic root of 648797731 is about 865.7046975516.

The spelling of 648797731 in words is "six hundred forty-eight million, seven hundred ninety-seven thousand, seven hundred thirty-one".