78323492478 has 96 divisors (see below), whose sum is σ = 198965662848. Its totient is φ = 20325547200.

The previous prime is 78323492473. The next prime is 78323492519. The reversal of 78323492478 is 87429432387.

It is a happy number.

It is a super-2 number, since 2×78323492478² (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 (78323492473) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3809101 + ... + 3829607.

It is an arithmetic number, because the mean of its divisors is an integer number (2072558988).

Almost surely, 2^78323492478 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78323492478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99482831424).

78323492478 is an abundant number, since it is smaller than the sum of its proper divisors (120642170370).

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

78323492478 is a wasteful number, since it uses less digits than its factorization.

78323492478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21718 (or 21711 counting only the distinct ones).

The product of its digits is 16257024, while the sum is 57.

The spelling of 78323492478 in words is "seventy-eight billion, three hundred twenty-three million, four hundred ninety-two thousand, four hundred seventy-eight".