777220000 has 60 divisors (see below), whose sum is σ = 1912126986. Its totient is φ = 310880000.

The previous prime is 777219997. The next prime is 777220009. The reversal of 777220000 is 22777.

It can be written as a sum of positive squares in 5 ways, for example, as 78357904 + 698862096 = 8852^2 + 26436^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (777220009) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 570 + ... + 39430.

Almost surely, 2^777220000 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 777220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (956063493).

777220000 is an abundant number, since it is smaller than the sum of its proper divisors (1134906986).

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

777220000 is an equidigital number, since it uses as much as digits as its factorization.

777220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38891 (or 38868 counting only the distinct ones).

The product of its (nonzero) digits is 1372, while the sum is 25.

The square root of 777220000 is about 27878.6656782566. The cubic root of 777220000 is about 919.4215014692.

Adding to 777220000 its reverse (22777), we get a palindrome (777242777).

It can be divided in two parts, 7772 and 20000, that added together give a palindrome (27772).

The spelling of 777220000 in words is "seven hundred seventy-seven million, two hundred twenty thousand".