77071967 has 4 divisors (see below), whose sum is σ = 88082256. Its totient is φ = 66061680.

The previous prime is 77071957. The next prime is 77072059. The reversal of 77071967 is 76917077.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76917077 = 29 ⋅2652313.

It is a cyclic number.

It is not a de Polignac number, because 77071967 - 2⁶ = 77071903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77071927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5505134 + ... + 5505147.

It is an arithmetic number, because the mean of its divisors is an integer number (22020564).

Almost surely, 2^77071967 is an apocalyptic number.

77071967 is a deficient number, since it is larger than the sum of its proper divisors (11010289).

77071967 is a wasteful number, since it uses less digits than its factorization.

77071967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11010288.

The product of its (nonzero) digits is 129654, while the sum is 44.

The square root of 77071967 is about 8779.0641300767. The cubic root of 77071967 is about 425.5645866730.

The spelling of 77071967 in words is "seventy-seven million, seventy-one thousand, nine hundred sixty-seven".