637680648 has 48 divisors (see below), whose sum is σ = 1752312240. Its totient is φ = 193235680.

The previous prime is 637680647. The next prime is 637680661. The reversal of 637680648 is 846086736.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 637680597 and 637680606.

It is not an unprimeable number, because it can be changed into a prime (637680647) 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, 106890 + ... + 112697.

It is an arithmetic number, because the mean of its divisors is an integer number (36506505).

Almost surely, 2^637680648 is an apocalyptic number.

It is an amenable number.

637680648 is an abundant number, since it is smaller than the sum of its proper divisors (1114631592).

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

637680648 is a wasteful number, since it uses less digits than its factorization.

637680648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219618 (or 219603 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 48.

The square root of 637680648 is about 25252.3394559791. The cubic root of 637680648 is about 860.7315966764.

The spelling of 637680648 in words is "six hundred thirty-seven million, six hundred eighty thousand, six hundred forty-eight".