640848452 has 6 divisors (see below), whose sum is σ = 1121484798. Its totient is φ = 320424224.

The previous prime is 640848449. The next prime is 640848469. The reversal of 640848452 is 254848046.

It can be written as a sum of positive squares in only one way, i.e., 485497156 + 155351296 = 22034^2 + 12464^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80106053 + ... + 80106060.

It is an arithmetic number, because the mean of its divisors is an integer number (186914133).

Almost surely, 2^640848452 is an apocalyptic number.

It is an amenable number.

640848452 is a deficient number, since it is larger than the sum of its proper divisors (480636346).

640848452 is a wasteful number, since it uses less digits than its factorization.

640848452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160212117 (or 160212115 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 41.

The square root of 640848452 is about 25314.9847323675. The cubic root of 640848452 is about 862.1545275228.

The spelling of 640848452 in words is "six hundred forty million, eight hundred forty-eight thousand, four hundred fifty-two".