77771320 has 32 divisors (see below), whose sum is σ = 190894320. Its totient is φ = 28280320.

The previous prime is 77771297. The next prime is 77771321. The reversal of 77771320 is 2317777.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77771321) 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, 87937 + ... + 88816.

Almost surely, 2^77771320 is an apocalyptic number.

It is an amenable number.

77771320 is an abundant number, since it is smaller than the sum of its proper divisors (113123000).

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

77771320 is a wasteful number, since it uses less digits than its factorization.

77771320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176775 (or 176771 counting only the distinct ones).

The product of its (nonzero) digits is 14406, while the sum is 34.

The square root of 77771320 is about 8818.8049076958. The cubic root of 77771320 is about 426.8479074846.

The spelling of 77771320 in words is "seventy-seven million, seven hundred seventy-one thousand, three hundred twenty".