647929648 has 20 divisors (see below), whose sum is σ = 1256030968. Its totient is φ = 323792640.

The previous prime is 647929631. The next prime is 647929649. The reversal of 647929648 is 846929746.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (647929649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23608 + ... + 43048.

Almost surely, 2^647929648 is an apocalyptic number.

It is an amenable number.

647929648 is a deficient number, since it is larger than the sum of its proper divisors (608101320).

647929648 is a wasteful number, since it uses less digits than its factorization.

647929648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21532 (or 21526 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 55.

The square root of 647929648 is about 25454.4622414224. The cubic root of 647929648 is about 865.3184246493.

The spelling of 647929648 in words is "six hundred forty-seven million, nine hundred twenty-nine thousand, six hundred forty-eight".