648667320 has 128 divisors (see below), whose sum is σ = 2231677440. Its totient is φ = 147755520.

The previous prime is 648667309. The next prime is 648667363. The reversal of 648667320 is 23766846.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 276874 + ... + 279206.

It is an arithmetic number, because the mean of its divisors is an integer number (17434980).

Almost surely, 2^648667320 is an apocalyptic number.

648667320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 648667320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1115838720).

648667320 is an abundant number, since it is smaller than the sum of its proper divisors (1583010120).

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

648667320 is a wasteful number, since it uses less digits than its factorization.

648667320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2685 (or 2681 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 42.

The square root of 648667320 is about 25468.9481526034. The cubic root of 648667320 is about 865.6466902687.

The spelling of 648667320 in words is "six hundred forty-eight million, six hundred sixty-seven thousand, three hundred twenty".