78864645 has 16 divisors (see below), whose sum is σ = 126916992. Its totient is φ = 41816640.

The previous prime is 78864563. The next prime is 78864647. The reversal of 78864645 is 54646887.

It is not a de Polignac number, because 78864645 - 2⁷ = 78864517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78864594 and 78864603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78864647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12601 + ... + 17790.

It is an arithmetic number, because the mean of its divisors is an integer number (7932312).

Almost surely, 2^78864645 is an apocalyptic number.

It is an amenable number.

78864645 is a deficient number, since it is larger than the sum of its proper divisors (48052347).

78864645 is a wasteful number, since it uses less digits than its factorization.

78864645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30572.

The product of its digits is 1290240, while the sum is 48.

The square root of 78864645 is about 8880.5768393725. The cubic root of 78864645 is about 428.8388449305.

The spelling of 78864645 in words is "seventy-eight million, eight hundred sixty-four thousand, six hundred forty-five".