78628551677650 has 24 divisors (see below), whose sum is σ = 157499037361764. Its totient is φ = 29032080619200.

The previous prime is 78628551677593. The next prime is 78628551677677. The reversal of 78628551677650 is 5677615582687.

It can be written as a sum of positive squares in 6 ways, for example, as 29432762488809 + 49195789188841 = 5425197^2 + 7013971^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60483500641 + ... + 60483501940.

Almost surely, 2^{78628551677650} is an apocalyptic number.

78628551677650 is an abundant number, since it is smaller than the sum of its proper divisors (78870485684114).

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

78628551677650 is a wasteful number, since it uses less digits than its factorization.

78628551677650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120967002606 (or 120967002601 counting only the distinct ones).

The product of its (nonzero) digits is 1185408000, while the sum is 73.

The spelling of 78628551677650 in words is "seventy-eight trillion, six hundred twenty-eight billion, five hundred fifty-one million, six hundred seventy-seven thousand, six hundred fifty".