77731449 has 16 divisors (see below), whose sum is σ = 106626240. Its totient is φ = 50339840.

The previous prime is 77731447. The next prime is 77731453. The reversal of 77731449 is 94413777.

It is a cyclic number.

It is not a de Polignac number, because 77731449 - 2¹ = 77731447 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 77731449.

It is not an unprimeable number, because it can be changed into a prime (77731447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30382 + ... + 32840.

It is an arithmetic number, because the mean of its divisors is an integer number (6664140).

Almost surely, 2^77731449 is an apocalyptic number.

It is an amenable number.

77731449 is a deficient number, since it is larger than the sum of its proper divisors (28894791).

77731449 is a wasteful number, since it uses less digits than its factorization.

77731449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2760.

The product of its digits is 148176, while the sum is 42.

The square root of 77731449 is about 8816.5440508172. The cubic root of 77731449 is about 426.7749510181.

The spelling of 77731449 in words is "seventy-seven million, seven hundred thirty-one thousand, four hundred forty-nine".