648861570 has 64 divisors (see below), whose sum is σ = 1977488640. Its totient is φ = 148310784.

The previous prime is 648861557. The next prime is 648861601. The reversal of 648861570 is 75168846.

It is a happy number.

648861570 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 169767 + ... + 173546.

It is an arithmetic number, because the mean of its divisors is an integer number (30898260).

Almost surely, 2^648861570 is an apocalyptic number.

648861570 is an abundant number, since it is smaller than the sum of its proper divisors (1328627070).

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

648861570 is a wasteful number, since it uses less digits than its factorization.

648861570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343336 (or 343330 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The square root of 648861570 is about 25472.7613344137. The cubic root of 648861570 is about 865.7330905350.

The spelling of 648861570 in words is "six hundred forty-eight million, eight hundred sixty-one thousand, five hundred seventy".