77609691 has 16 divisors (see below), whose sum is σ = 116272800. Its totient is φ = 51156864.

The previous prime is 77609689. The next prime is 77609717. The reversal of 77609691 is 19690677.

It is not a de Polignac number, because 77609691 - 2¹ = 77609689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77609611) 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 15 ways as a sum of consecutive naturals, for example, 13746 + ... + 18551.

It is an arithmetic number, because the mean of its divisors is an integer number (7267050).

Almost surely, 2^77609691 is an apocalyptic number.

77609691 is a deficient number, since it is larger than the sum of its proper divisors (38663109).

77609691 is a wasteful number, since it uses less digits than its factorization.

77609691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32395 (or 32389 counting only the distinct ones).

The product of its (nonzero) digits is 142884, while the sum is 45.

The square root of 77609691 is about 8809.6362580983. The cubic root of 77609691 is about 426.5520021327.

The spelling of 77609691 in words is "seventy-seven million, six hundred nine thousand, six hundred ninety-one".