77971771 has 8 divisors (see below), whose sum is σ = 83255040. Its totient is φ = 72846312.

The previous prime is 77971753. The next prime is 77971781. The reversal of 77971771 is 17717977.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77971771 - 2⁹ = 77971259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77971781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38431 + ... + 40408.

It is an arithmetic number, because the mean of its divisors is an integer number (10406880).

Almost surely, 2^77971771 is an apocalyptic number.

77971771 is a deficient number, since it is larger than the sum of its proper divisors (5283269).

77971771 is a wasteful number, since it uses less digits than its factorization.

77971771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78905.

The product of its digits is 151263, while the sum is 46.

The square root of 77971771 is about 8830.1625692849. The cubic root of 77971771 is about 427.2143179838.

The spelling of 77971771 in words is "seventy-seven million, nine hundred seventy-one thousand, seven hundred seventy-one".