78398493878 has 8 divisors (see below), whose sum is σ = 118739466768. Its totient is φ = 38818671624.

The previous prime is 78398493857. The next prime is 78398493893. The reversal of 78398493878 is 87839489387.

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

It is a super-2 number, since 2×78398493878² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

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, 190287401 + ... + 190287812.

It is an arithmetic number, because the mean of its divisors is an integer number (14842433346).

Almost surely, 2^78398493878 is an apocalyptic number.

78398493878 is a deficient number, since it is larger than the sum of its proper divisors (40340972890).

78398493878 is a wasteful number, since it uses less digits than its factorization.

78398493878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380575318.

The product of its digits is 585252864, while the sum is 74.

The spelling of 78398493878 in words is "seventy-eight billion, three hundred ninety-eight million, four hundred ninety-three thousand, eight hundred seventy-eight".