7678428578 has 8 divisors (see below), whose sum is σ = 11562459372. Its totient is φ = 3824275456.

The previous prime is 7678428547. The next prime is 7678428581. The reversal of 7678428578 is 8758248767.

It can be written as a sum of positive squares in 2 ways, for example, as 7043741329 + 634687249 = 83927^2 + 25193^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 7678428578.

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, 7468775 + ... + 7469802.

Almost surely, 2^7678428578 is an apocalyptic number.

7678428578 is a deficient number, since it is larger than the sum of its proper divisors (3884030794).

7678428578 is a wasteful number, since it uses less digits than its factorization.

7678428578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14938836.

The product of its digits is 42147840, while the sum is 62.

The square root of 7678428578 is about 87626.6430830258. The cubic root of 7678428578 is about 1972.8350857053.

The spelling of 7678428578 in words is "seven billion, six hundred seventy-eight million, four hundred twenty-eight thousand, five hundred seventy-eight".