7728205678 has 32 divisors (see below), whose sum is σ = 12390900480. Its totient is φ = 3602352000.

The previous prime is 7728205633. The next prime is 7728205687. The reversal of 7728205678 is 8765028277.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2375553 + ... + 2378803.

It is an arithmetic number, because the mean of its divisors is an integer number (387215640).

Almost surely, 2^7728205678 is an apocalyptic number.

7728205678 is a deficient number, since it is larger than the sum of its proper divisors (4662694802).

7728205678 is a wasteful number, since it uses less digits than its factorization.

7728205678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3912.

The product of its (nonzero) digits is 2634240, while the sum is 52.

The square root of 7728205678 is about 87910.2137296913. The cubic root of 7728205678 is about 1977.0890188269.

The spelling of 7728205678 in words is "seven billion, seven hundred twenty-eight million, two hundred five thousand, six hundred seventy-eight".