78981777810 has 256 divisors, whose sum is σ = 241416806400. Its totient is φ = 18202447872.

The previous prime is 78981777767. The next prime is 78981777829. The reversal of 78981777810 is 1877718987.

It is a super-2 number, since 2×78981777810² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 11751631 + ... + 11758349.

It is an arithmetic number, because the mean of its divisors is an integer number (943034400).

Almost surely, 2^78981777810 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78981777810, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120708403200).

78981777810 is an abundant number, since it is smaller than the sum of its proper divisors (162435028590).

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

78981777810 is a wasteful number, since it uses less digits than its factorization.

78981777810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6962 (or 6956 counting only the distinct ones).

The product of its (nonzero) digits is 11063808, while the sum is 63.

The spelling of 78981777810 in words is "seventy-eight billion, nine hundred eighty-one million, seven hundred seventy-seven thousand, eight hundred ten".