77774761 has 3 divisors (see below), whose sum is σ = 77783581. Its totient is φ = 77765942.

The previous prime is 77774737. The next prime is 77774773. The reversal of 77774761 is 16747777.

The square root of 77774761 is 8819.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16747777 = 179 ⋅93563.

It is not a de Polignac number, because 77774761 - 2⁷ = 77774633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77774791) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4410 + ... + 13228.

Almost surely, 2^77774761 is an apocalyptic number.

77774761 is the 8819-th square number.

77774761 is the 4410-th centered octagonal number.

It is an amenable number.

77774761 is a deficient number, since it is larger than the sum of its proper divisors (8820).

77774761 is an frugal number, since it uses more digits than its factorization.

77774761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17638 (or 8819 counting only the distinct ones).

The product of its digits is 403368, while the sum is 46.

The cubic root of 77774761 is about 426.8542027015.

The spelling of 77774761 in words is "seventy-seven million, seven hundred seventy-four thousand, seven hundred sixty-one".