77141780 has 24 divisors (see below), whose sum is σ = 163605960. Its totient is φ = 30550400.

The previous prime is 77141773. The next prime is 77141783. The reversal of 77141780 is 8714177.

It can be written as a sum of positive squares in 4 ways, for example, as 10523536 + 66618244 = 3244^2 + 8162^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 77141780.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77141783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17075 + ... + 21114.

It is an arithmetic number, because the mean of its divisors is an integer number (6816915).

Almost surely, 2^77141780 is an apocalyptic number.

It is an amenable number.

77141780 is an abundant number, since it is smaller than the sum of its proper divisors (86464180).

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

77141780 is a wasteful number, since it uses less digits than its factorization.

77141780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38299 (or 38297 counting only the distinct ones).

The product of its (nonzero) digits is 10976, while the sum is 35.

The square root of 77141780 is about 8783.0393372682. The cubic root of 77141780 is about 425.6930422606.

The spelling of 77141780 in words is "seventy-seven million, one hundred forty-one thousand, seven hundred eighty".