7681657628 has 12 divisors (see below), whose sum is σ = 13728920352. Its totient is φ = 3759108960.

The previous prime is 7681657609. The next prime is 7681657639. The reversal of 7681657628 is 8267561867.

It is a hoax number, since the sum of its digits (56) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 20429753 + ... + 20430128.

It is an arithmetic number, because the mean of its divisors is an integer number (1144076696).

Almost surely, 2^7681657628 is an apocalyptic number.

It is an amenable number.

7681657628 is a deficient number, since it is larger than the sum of its proper divisors (6047262724).

7681657628 is a wasteful number, since it uses less digits than its factorization.

7681657628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40859932 (or 40859930 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 56.

The square root of 7681657628 is about 87645.0661931406. The cubic root of 7681657628 is about 1973.1115958569. Note that the first 3 decimals are identical.

The spelling of 7681657628 in words is "seven billion, six hundred eighty-one million, six hundred fifty-seven thousand, six hundred twenty-eight".