78820130 has 8 divisors (see below), whose sum is σ = 141876252. Its totient is φ = 31528048.

The previous prime is 78820129. The next prime is 78820141. The reversal of 78820130 is 3102887.

It can be written as a sum of positive squares in 2 ways, for example, as 77986561 + 833569 = 8831^2 + 913^2 .

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

It is a super-2 number, since 2×78820130² = 12425225786433800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78820093 and 78820102.

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, 3940997 + ... + 3941016.

Almost surely, 2^78820130 is an apocalyptic number.

78820130 is a deficient number, since it is larger than the sum of its proper divisors (63056122).

78820130 is a wasteful number, since it uses less digits than its factorization.

78820130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7882020.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 78820130 is about 8878.0701731852. The cubic root of 78820130 is about 428.7581439859.

The spelling of 78820130 in words is "seventy-eight million, eight hundred twenty thousand, one hundred thirty".