77696491 has 4 divisors (see below), whose sum is σ = 81785800. Its totient is φ = 73607184.

The previous prime is 77696471. The next prime is 77696527. The reversal of 77696491 is 19469677.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19469677 = 811 ⋅24007.

It is a cyclic number.

It is not a de Polignac number, because 77696491 - 2⁷ = 77696363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77696431) 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, 2044626 + ... + 2044663.

It is an arithmetic number, because the mean of its divisors is an integer number (20446450).

Almost surely, 2^77696491 is an apocalyptic number.

77696491 is a deficient number, since it is larger than the sum of its proper divisors (4089309).

77696491 is a wasteful number, since it uses less digits than its factorization.

77696491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4089308.

The product of its digits is 571536, while the sum is 49.

The square root of 77696491 is about 8814.5613050225. The cubic root of 77696491 is about 426.7109638931.

It can be divided in two parts, 77696 and 491, that added together give a palindrome (78187).

The spelling of 77696491 in words is "seventy-seven million, six hundred ninety-six thousand, four hundred ninety-one".