77749447 has 8 divisors (see below), whose sum is σ = 79040000. Its totient is φ = 76469400.

The previous prime is 77749411. The next prime is 77749459. The reversal of 77749447 is 74494777.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77749447 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77749447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77749747) 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 7 ways as a sum of consecutive naturals, for example, 13054 + ... + 18052.

It is an arithmetic number, because the mean of its divisors is an integer number (9880000).

Almost surely, 2^77749447 is an apocalyptic number.

77749447 is a deficient number, since it is larger than the sum of its proper divisors (1290553).

77749447 is a wasteful number, since it uses less digits than its factorization.

77749447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5253.

The product of its digits is 1382976, while the sum is 49.

The square root of 77749447 is about 8817.5646864653. The cubic root of 77749447 is about 426.8078870773.

The spelling of 77749447 in words is "seventy-seven million, seven hundred forty-nine thousand, four hundred forty-seven".