78846643420 has 12 divisors (see below), whose sum is σ = 165577951224. Its totient is φ = 31538657360.

The previous prime is 78846643387. The next prime is 78846643429. The reversal of 78846643420 is 2434664887.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78846643429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1971166066 + ... + 1971166105.

It is an arithmetic number, because the mean of its divisors is an integer number (13798162602).

Almost surely, 2^78846643420 is an apocalyptic number.

It is an amenable number.

78846643420 is an abundant number, since it is smaller than the sum of its proper divisors (86731307804).

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

78846643420 is a wasteful number, since it uses less digits than its factorization.

78846643420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3942332180 (or 3942332178 counting only the distinct ones).

The product of its (nonzero) digits is 6193152, while the sum is 52.

The spelling of 78846643420 in words is "seventy-eight billion, eight hundred forty-six million, six hundred forty-three thousand, four hundred twenty".