77215649 has 8 divisors (see below), whose sum is σ = 93437568. Its totient is φ = 62291520.

The previous prime is 77215597. The next prime is 77215657. The reversal of 77215649 is 94651277.

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 77215649 - 2¹⁶ = 77150113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77215249) 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, 324317 + ... + 324554.

It is an arithmetic number, because the mean of its divisors is an integer number (11679696).

Almost surely, 2^77215649 is an apocalyptic number.

It is an amenable number.

77215649 is a deficient number, since it is larger than the sum of its proper divisors (16221919).

77215649 is a wasteful number, since it uses less digits than its factorization.

77215649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648895.

The product of its digits is 105840, while the sum is 41.

The square root of 77215649 is about 8787.2435382206. The cubic root of 77215649 is about 425.8288765108.

The spelling of 77215649 in words is "seventy-seven million, two hundred fifteen thousand, six hundred forty-nine".