648040697 has 8 divisors (see below), whose sum is σ = 686478312. Its totient is φ = 609638400.

The previous prime is 648040667. The next prime is 648040703. The reversal of 648040697 is 796040846.

It can be written as a sum of positive squares in 4 ways, for example, as 32761 + 648007936 = 181^2 + 25456^2 .

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 648040697 - 2⁶ = 648040633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (648040667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35297 + ... + 50417.

It is an arithmetic number, because the mean of its divisors is an integer number (85809789).

Almost surely, 2^648040697 is an apocalyptic number.

It is an amenable number.

648040697 is a deficient number, since it is larger than the sum of its proper divisors (38437615).

648040697 is a wasteful number, since it uses less digits than its factorization.

648040697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17659.

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 648040697 is about 25456.6434747396. The cubic root of 648040697 is about 865.3678576172.

The spelling of 648040697 in words is "six hundred forty-eight million, forty thousand, six hundred ninety-seven".