648698756 has 6 divisors (see below), whose sum is σ = 1135222830. Its totient is φ = 324349376.

The previous prime is 648698719. The next prime is 648698759. The reversal of 648698756 is 657896846.

It can be written as a sum of positive squares in only one way, i.e., 454542400 + 194156356 = 21320^2 + 13934^2 .

It is a junction number, because it is equal to n+sod(n) for n = 648698695 and 648698704.

It is not an unprimeable number, because it can be changed into a prime (648698759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81087341 + ... + 81087348.

It is an arithmetic number, because the mean of its divisors is an integer number (189203805).

Almost surely, 2^648698756 is an apocalyptic number.

It is an amenable number.

648698756 is a deficient number, since it is larger than the sum of its proper divisors (486524074).

648698756 is a wasteful number, since it uses less digits than its factorization.

648698756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162174693 (or 162174691 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 59.

The square root of 648698756 is about 25469.5652887912. The cubic root of 648698756 is about 865.6606738260.

The spelling of 648698756 in words is "six hundred forty-eight million, six hundred ninety-eight thousand, seven hundred fifty-six".