77777361 has 8 divisors (see below), whose sum is σ = 115225760. Its totient is φ = 51851556.

The previous prime is 77777327. The next prime is 77777377. The reversal of 77777361 is 16377777.

It is a happy number.

It is not a de Polignac number, because 77777361 - 2¹⁵ = 77744593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77777321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1440295 + ... + 1440348.

It is an arithmetic number, because the mean of its divisors is an integer number (14403220).

Almost surely, 2^77777361 is an apocalyptic number.

It is an amenable number.

77777361 is a deficient number, since it is larger than the sum of its proper divisors (37448399).

77777361 is a wasteful number, since it uses less digits than its factorization.

77777361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2880652 (or 2880646 counting only the distinct ones).

The product of its digits is 302526, while the sum is 45.

The square root of 77777361 is about 8819.1474077713. The cubic root of 77777361 is about 426.8589592084.

The spelling of 77777361 in words is "seventy-seven million, seven hundred seventy-seven thousand, three hundred sixty-one".