648238657472 has 28 divisors (see below), whose sum is σ = 1470112670640. Its totient is φ = 277816567296.

The previous prime is 648238657471. The next prime is 648238657489. The reversal of 648238657472 is 274756832846.

648238657472 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (28).

It is a super-2 number, since 2×648238657472² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648238657471) 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, 723480197 + ... + 723481092.

Almost surely, 2^648238657472 is an apocalyptic number.

It is an amenable number.

648238657472 is an abundant number, since it is smaller than the sum of its proper divisors (821874013168).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

648238657472 is a wasteful number, since it uses less digits than its factorization.

648238657472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1446961308 (or 1446961298 counting only the distinct ones).

The product of its digits is 108380160, while the sum is 62.

The spelling of 648238657472 in words is "six hundred forty-eight billion, two hundred thirty-eight million, six hundred fifty-seven thousand, four hundred seventy-two".