77869780 has 12 divisors (see below), whose sum is σ = 163526580. Its totient is φ = 31147904.

The previous prime is 77869763. The next prime is 77869801. The reversal of 77869780 is 8796877.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 24462916 + 53406864 = 4946^2 + 7308^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1946725 + ... + 1946764.

It is an arithmetic number, because the mean of its divisors is an integer number (13627215).

Almost surely, 2^77869780 is an apocalyptic number.

It is an amenable number.

77869780 is an abundant number, since it is smaller than the sum of its proper divisors (85656800).

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

77869780 is a wasteful number, since it uses less digits than its factorization.

77869780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3893498 (or 3893496 counting only the distinct ones).

The product of its (nonzero) digits is 1185408, while the sum is 52.

The square root of 77869780 is about 8824.3855310157. The cubic root of 77869780 is about 427.0279640983.

The spelling of 77869780 in words is "seventy-seven million, eight hundred sixty-nine thousand, seven hundred eighty".