978637736878 has 8 divisors (see below), whose sum is σ = 1468016734968. Its totient is φ = 489298825224.

The previous prime is 978637736861. The next prime is 978637736893. The reversal of 978637736878 is 878637736879.

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

It is a super-2 number, since 2×978637736878² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 978637736798 and 978637736807.

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, 9960501 + ... + 10058272.

It is an arithmetic number, because the mean of its divisors is an integer number (183502091871).

Almost surely, 2^978637736878 is an apocalyptic number.

978637736878 is a deficient number, since it is larger than the sum of its proper divisors (489378998090).

978637736878 is a wasteful number, since it uses less digits than its factorization.

978637736878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20043218.

The product of its digits is 3584673792, while the sum is 79.

Subtracting from 978637736878 its reverse (878637736879), we obtain a palindrome (99999999999).

The spelling of 978637736878 in words is "nine hundred seventy-eight billion, six hundred thirty-seven million, seven hundred thirty-six thousand, eight hundred seventy-eight".