647651748 has 24 divisors (see below), whose sum is σ = 1533744352. Its totient is φ = 212661504.

The previous prime is 647651747. The next prime is 647651749. The reversal of 647651748 is 847156746.

It is an interprime number because it is at equal distance from previous prime (647651747) and next prime (647651749).

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 647651697 and 647651706.

It is not an unprimeable number, because it can be changed into a prime (647651747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 401965 + ... + 403572.

Almost surely, 2^647651748 is an apocalyptic number.

It is an amenable number.

647651748 is an abundant number, since it is smaller than the sum of its proper divisors (886092604).

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

647651748 is a wasteful number, since it uses less digits than its factorization.

647651748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805611 (or 805609 counting only the distinct ones).

The product of its digits is 1128960, while the sum is 48.

The square root of 647651748 is about 25449.0028881290. The cubic root of 647651748 is about 865.1946939433.

The spelling of 647651748 in words is "six hundred forty-seven million, six hundred fifty-one thousand, seven hundred forty-eight".