77777400000 has 168 divisors, whose sum is σ = 257218068240. Its totient is φ = 20740480000.

The previous prime is 77777399983. The next prime is 77777400079. The reversal of 77777400000 is 477777.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 535186 + ... + 664814.

It is an arithmetic number, because the mean of its divisors is an integer number (1531059930).

Almost surely, 2^77777400000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77777400000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128609034120).

77777400000 is an abundant number, since it is smaller than the sum of its proper divisors (179440668240).

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

77777400000 is an equidigital number, since it uses as much as digits as its factorization.

77777400000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129669 (or 129639 counting only the distinct ones).

The product of its (nonzero) digits is 67228, while the sum is 39.

Adding to 77777400000 its reverse (477777), we get a palindrome (77777877777).

The spelling of 77777400000 in words is "seventy-seven billion, seven hundred seventy-seven million, four hundred thousand".