77777000770 has 24 divisors (see below), whose sum is σ = 162855516924. Its totient is φ = 26666400096.

The previous prime is 77777000761. The next prime is 77777000773. The reversal of 77777000770 is 7700077777.

It can be written as a sum of positive squares in 2 ways, for example, as 67077374049 + 10699626721 = 258993^2 + 103439^2 .

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (77777000773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79363797 + ... + 79364776.

Almost surely, 2^77777000770 is an apocalyptic number.

77777000770 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

77777000770 is an abundant number, since it is smaller than the sum of its proper divisors (85078516154).

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

77777000770 is a wasteful number, since it uses less digits than its factorization.

77777000770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158728594 (or 158728587 counting only the distinct ones).

The product of its (nonzero) digits is 823543, while the sum is 49.

The spelling of 77777000770 in words is "seventy-seven billion, seven hundred seventy-seven million, seven hundred seventy", and thus it is an aban number.