663675940 has 24 divisors (see below), whose sum is σ = 1408091832. Its totient is φ = 262732800.

The previous prime is 663675917. The next prime is 663675959. The reversal of 663675940 is 49576366.

It can be written as a sum of positive squares in 4 ways, for example, as 74545956 + 589129984 = 8634^2 + 24272^2 .

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, 169111 + ... + 172990.

It is an arithmetic number, because the mean of its divisors is an integer number (58670493).

Almost surely, 2^663675940 is an apocalyptic number.

It is an amenable number.

663675940 is an abundant number, since it is smaller than the sum of its proper divisors (744415892).

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

663675940 is a wasteful number, since it uses less digits than its factorization.

663675940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342207 (or 342205 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 46.

The square root of 663675940 is about 25761.9087025787. The cubic root of 663675940 is about 872.2721862342.

The spelling of 663675940 in words is "six hundred sixty-three million, six hundred seventy-five thousand, nine hundred forty".