77067891 has 12 divisors (see below), whose sum is σ = 114911680. Its totient is φ = 49721040.

The previous prime is 77067869. The next prime is 77067901. The reversal of 77067891 is 19876077.

It is a happy number.

It is not a de Polignac number, because 77067891 - 2⁷ = 77067763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77067821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 137836 + ... + 138393.

Almost surely, 2^77067891 is an apocalyptic number.

77067891 is a deficient number, since it is larger than the sum of its proper divisors (37843789).

77067891 is a wasteful number, since it uses less digits than its factorization.

77067891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276266 (or 276263 counting only the distinct ones).

The product of its (nonzero) digits is 148176, while the sum is 45.

The square root of 77067891 is about 8778.8319838120. The cubic root of 77067891 is about 425.5570844561.

The spelling of 77067891 in words is "seventy-seven million, sixty-seven thousand, eight hundred ninety-one".