77967691 has 4 divisors (see below), whose sum is σ = 79869384. Its totient is φ = 76066000.

The previous prime is 77967679. The next prime is 77967737. The reversal of 77967691 is 19676977.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77967691 - 2⁷ = 77967563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77967671) 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 3 ways as a sum of consecutive naturals, for example, 950785 + ... + 950866.

It is an arithmetic number, because the mean of its divisors is an integer number (19967346).

Almost surely, 2^77967691 is an apocalyptic number.

77967691 is a deficient number, since it is larger than the sum of its proper divisors (1901693).

77967691 is a wasteful number, since it uses less digits than its factorization.

77967691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1901692.

The product of its digits is 1000188, while the sum is 52.

The square root of 77967691 is about 8829.9315399385. The cubic root of 77967691 is about 427.2068662920.

The spelling of 77967691 in words is "seventy-seven million, nine hundred sixty-seven thousand, six hundred ninety-one".