7928643208 has 16 divisors (see below), whose sum is σ = 14874154380. Its totient is φ = 3962202048.

The previous prime is 7928643199. The next prime is 7928643241. The reversal of 7928643208 is 8023468297.

It can be written as a sum of positive squares in 2 ways, for example, as 7266198564 + 662444644 = 85242^2 + 25738^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248991 + ... + 279022.

Almost surely, 2^7928643208 is an apocalyptic number.

It is an amenable number.

7928643208 is a deficient number, since it is larger than the sum of its proper divisors (6945511172).

7928643208 is a wasteful number, since it uses less digits than its factorization.

7928643208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529896 (or 529892 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 49.

The square root of 7928643208 is about 89042.9290174127. The cubic root of 7928643208 is about 1994.0358327003.

The spelling of 7928643208 in words is "seven billion, nine hundred twenty-eight million, six hundred forty-three thousand, two hundred eight".