648997344 has 72 divisors (see below), whose sum is σ = 1852125912. Its totient is φ = 215566080.

The previous prime is 648997343. The next prime is 648997411. The reversal of 648997344 is 443799846.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648997343) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80539 + ... + 88229.

It is an arithmetic number, because the mean of its divisors is an integer number (25723971).

Almost surely, 2^648997344 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 648997344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (926062956).

648997344 is an abundant number, since it is smaller than the sum of its proper divisors (1203128568).

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

648997344 is a wasteful number, since it uses less digits than its factorization.

648997344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8000 (or 7989 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 54.

The square root of 648997344 is about 25475.4262771008. The cubic root of 648997344 is about 865.7934710806.

The spelling of 648997344 in words is "six hundred forty-eight million, nine hundred ninety-seven thousand, three hundred forty-four".