6443680628 has 24 divisors (see below), whose sum is σ = 14058940224. Its totient is φ = 2510524800.

The previous prime is 6443680613. The next prime is 6443680631. The reversal of 6443680628 is 8260863446.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10460213 + ... + 10460828.

It is an arithmetic number, because the mean of its divisors is an integer number (585789176).

Almost surely, 2^6443680628 is an apocalyptic number.

It is an amenable number.

6443680628 is an abundant number, since it is smaller than the sum of its proper divisors (7615259596).

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

6443680628 is a wasteful number, since it uses less digits than its factorization.

6443680628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20921063 (or 20921061 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 47.

The square root of 6443680628 is about 80272.5396882396. The cubic root of 6443680628 is about 1860.8498667572.

The spelling of 6443680628 in words is "six billion, four hundred forty-three million, six hundred eighty thousand, six hundred twenty-eight".