77508649 has 8 divisors (see below), whose sum is σ = 80179200. Its totient is φ = 74848800.

The previous prime is 77508647. The next prime is 77508667. The reversal of 77508649 is 94680577.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 77508649 - 2¹ = 77508647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77508599 and 77508608.

It is not an unprimeable number, because it can be changed into a prime (77508647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13752 + ... + 18550.

It is an arithmetic number, because the mean of its divisors is an integer number (10022400).

Almost surely, 2^77508649 is an apocalyptic number.

It is an amenable number.

77508649 is a deficient number, since it is larger than the sum of its proper divisors (2670551).

77508649 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (77508648) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (5351).

77508649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5351.

The product of its (nonzero) digits is 423360, while the sum is 46.

The square root of 77508649 is about 8803.8996473154. The cubic root of 77508649 is about 426.3668088294.

The spelling of 77508649 in words is "seventy-seven million, five hundred eight thousand, six hundred forty-nine".