648689997 has 4 divisors (see below), whose sum is σ = 864920000. Its totient is φ = 432459996.

The previous prime is 648689989. The next prime is 648690017. The reversal of 648689997 is 799986846.

648689997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 648689997 - 2³ = 648689989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648689597) 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, 108114997 + ... + 108115002.

It is an arithmetic number, because the mean of its divisors is an integer number (216230000).

Almost surely, 2^648689997 is an apocalyptic number.

It is an amenable number.

648689997 is a deficient number, since it is larger than the sum of its proper divisors (216230003).

648689997 is a wasteful number, since it uses less digits than its factorization.

648689997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216230002.

The product of its digits is 47029248, while the sum is 66.

The square root of 648689997 is about 25469.3933378869. The cubic root of 648689997 is about 865.6567776385.

The spelling of 648689997 in words is "six hundred forty-eight million, six hundred eighty-nine thousand, nine hundred ninety-seven".