977873378778 has 96 divisors (see below), whose sum is σ = 2200372761600. Its totient is φ = 313486588800.

The previous prime is 977873378723. The next prime is 977873378789. The reversal of 977873378778 is 877873378779.

It is a junction number, because it is equal to n+sod(n) for n = 977873378697 and 977873378706.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 288371463 + ... + 288374853.

It is an arithmetic number, because the mean of its divisors is an integer number (22920549600).

Almost surely, 2^977873378778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 977873378778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1100186380800).

977873378778 is an abundant number, since it is smaller than the sum of its proper divisors (1222499382822).

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

977873378778 is a wasteful number, since it uses less digits than its factorization.

977873378778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5428 (or 5425 counting only the distinct ones).

The product of its digits is 4879139328, while the sum is 81.

Subtracting from 977873378778 its reverse (877873378779), we obtain a palindrome (99999999999).

The spelling of 977873378778 in words is "nine hundred seventy-seven billion, eight hundred seventy-three million, three hundred seventy-eight thousand, seven hundred seventy-eight".