78421966782 has 8 divisors (see below), whose sum is σ = 156843933576. Its totient is φ = 26140655592.

The previous prime is 78421966771. The next prime is 78421966789. The reversal of 78421966782 is 28766912487.

It is a happy number.

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

78421966782 is an admirable number.

It is a super-2 number, since 2×78421966782² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78421966789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6535163893 + ... + 6535163904.

It is an arithmetic number, because the mean of its divisors is an integer number (19605491697).

Almost surely, 2^78421966782 is an apocalyptic number.

78421966782 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

78421966782 is a wasteful number, since it uses less digits than its factorization.

78421966782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13070327802.

The product of its digits is 16257024, while the sum is 60.

The spelling of 78421966782 in words is "seventy-eight billion, four hundred twenty-one million, nine hundred sixty-six thousand, seven hundred eighty-two".