78220819626 has 32 divisors (see below), whose sum is σ = 164924080128. Its totient is φ = 24695657520.

The previous prime is 78220819619. The next prime is 78220819709. The reversal of 78220819626 is 62691802287.

It is a super-2 number, since 2×78220819626² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4465110 + ... + 4482593.

It is an arithmetic number, because the mean of its divisors is an integer number (5153877504).

Almost surely, 2^78220819626 is an apocalyptic number.

78220819626 is an abundant number, since it is smaller than the sum of its proper divisors (86703260502).

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

78220819626 is a wasteful number, since it uses less digits than its factorization.

78220819626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8947786.

The product of its (nonzero) digits is 1161216, while the sum is 51.

The spelling of 78220819626 in words is "seventy-eight billion, two hundred twenty million, eight hundred nineteen thousand, six hundred twenty-six".