648743780 has 24 divisors (see below), whose sum is σ = 1364165880. Its totient is φ = 259153920.

The previous prime is 648743759. The next prime is 648743807. The reversal of 648743780 is 87347846.

It can be written as a sum of positive squares in 4 ways, for example, as 430336 + 648313444 = 656^2 + 25462^2 .

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5711 + ... + 36470.

It is an arithmetic number, because the mean of its divisors is an integer number (56840245).

Almost surely, 2^648743780 is an apocalyptic number.

It is an amenable number.

648743780 is an abundant number, since it is smaller than the sum of its proper divisors (715422100).

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

648743780 is a wasteful number, since it uses less digits than its factorization.

648743780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42959 (or 42957 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 47.

The square root of 648743780 is about 25470.4491519094. The cubic root of 648743780 is about 865.6807008951.

The spelling of 648743780 in words is "six hundred forty-eight million, seven hundred forty-three thousand, seven hundred eighty".