664655240 has 16 divisors (see below), whose sum is σ = 1495474380. Its totient is φ = 265862080.

The previous prime is 664655231. The next prime is 664655269. The reversal of 664655240 is 42556466.

It can be written as a sum of positive squares in 2 ways, for example, as 655667236 + 8988004 = 25606^2 + 2998^2 .

It is a junction number, because it is equal to n+sod(n) for n = 664655194 and 664655203.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8308151 + ... + 8308230.

Almost surely, 2^664655240 is an apocalyptic number.

It is an amenable number.

664655240 is an abundant number, since it is smaller than the sum of its proper divisors (830819140).

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

664655240 is a wasteful number, since it uses less digits than its factorization.

664655240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16616392 (or 16616388 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 38.

The square root of 664655240 is about 25780.9084401617. The cubic root of 664655240 is about 872.7010081400.

The spelling of 664655240 in words is "six hundred sixty-four million, six hundred fifty-five thousand, two hundred forty".