78447645 has 24 divisors (see below), whose sum is σ = 136749600. Its totient is φ = 41600736.

The previous prime is 78447623. The next prime is 78447667. The reversal of 78447645 is 54674487.

It is an interprime number because it is at equal distance from previous prime (78447623) and next prime (78447667).

It is not a de Polignac number, because 78447645 - 2⁷ = 78447517 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 78447645.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 3186 + ... + 12924.

It is an arithmetic number, because the mean of its divisors is an integer number (5697900).

Almost surely, 2^78447645 is an apocalyptic number.

It is an amenable number.

78447645 is a deficient number, since it is larger than the sum of its proper divisors (58301955).

78447645 is a wasteful number, since it uses less digits than its factorization.

78447645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9929 (or 9926 counting only the distinct ones).

The product of its digits is 752640, while the sum is 45.

The square root of 78447645 is about 8857.0675169607. The cubic root of 78447645 is about 428.0816745899.

The spelling of 78447645 in words is "seventy-eight million, four hundred forty-seven thousand, six hundred forty-five".