77649649 has 8 divisors (see below), whose sum is σ = 96810048. Its totient is φ = 60506160.

The previous prime is 77649641. The next prime is 77649683. The reversal of 77649649 is 94694677.

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

It is not a de Polignac number, because 77649649 - 2³ = 77649641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77649596 and 77649605.

It is not an unprimeable number, because it can be changed into a prime (77649641) 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, 504142 + ... + 504295.

It is an arithmetic number, because the mean of its divisors is an integer number (12101256).

Almost surely, 2^77649649 is an apocalyptic number.

It is an amenable number.

77649649 is a deficient number, since it is larger than the sum of its proper divisors (19160399).

77649649 is a wasteful number, since it uses less digits than its factorization.

77649649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1008455.

The product of its digits is 2286144, while the sum is 52.

The square root of 77649649 is about 8811.9038238056. The cubic root of 77649649 is about 426.6251941976.

The spelling of 77649649 in words is "seventy-seven million, six hundred forty-nine thousand, six hundred forty-nine".