648240720 has 80 divisors (see below), whose sum is σ = 2012014080. Its totient is φ = 172652032.

The previous prime is 648240713. The next prime is 648240737. The reversal of 648240720 is 27042846.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×648240720² = 840432062132236800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 344422 + ... + 346298.

It is an arithmetic number, because the mean of its divisors is an integer number (25150176).

Almost surely, 2^648240720 is an apocalyptic number.

648240720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

648240720 is an abundant number, since it is smaller than the sum of its proper divisors (1363773360).

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

648240720 is a wasteful number, since it uses less digits than its factorization.

648240720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3332 (or 3326 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 33.

The square root of 648240720 is about 25460.5718710323. The cubic root of 648240720 is about 865.4568827200.

The spelling of 648240720 in words is "six hundred forty-eight million, two hundred forty thousand, seven hundred twenty".