78066649 has 8 divisors (see below), whose sum is σ = 84826880. Its totient is φ = 71571600.

The previous prime is 78066647. The next prime is 78066661. The reversal of 78066649 is 94666087.

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 78066649 - 2¹ = 78066647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78066599 and 78066608.

It is not an unprimeable number, because it can be changed into a prime (78066643) 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, 65682 + ... + 66859.

It is an arithmetic number, because the mean of its divisors is an integer number (10603360).

Almost surely, 2^78066649 is an apocalyptic number.

It is an amenable number.

78066649 is a deficient number, since it is larger than the sum of its proper divisors (6760231).

78066649 is a wasteful number, since it uses less digits than its factorization.

78066649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132591.

The product of its (nonzero) digits is 435456, while the sum is 46.

The square root of 78066649 is about 8835.5333172367. The cubic root of 78066649 is about 427.3875294338.

The spelling of 78066649 in words is "seventy-eight million, sixty-six thousand, six hundred forty-nine".