78447647 has 8 divisors (see below), whose sum is σ = 80350512. Its totient is φ = 76564800.

The previous prime is 78447623. The next prime is 78447667. The reversal of 78447647 is 74674487.

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 78447647 - 2⁶ = 78447583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78447667) 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, 3083 + ... + 12899.

It is an arithmetic number, because the mean of its divisors is an integer number (10043814).

Almost surely, 2^78447647 is an apocalyptic number.

78447647 is a deficient number, since it is larger than the sum of its proper divisors (1902865).

78447647 is a wasteful number, since it uses less digits than its factorization.

78447647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10009.

The product of its digits is 1053696, while the sum is 47.

The square root of 78447647 is about 8857.0676298649. The cubic root of 78447647 is about 428.0816782278.

The spelling of 78447647 in words is "seventy-eight million, four hundred forty-seven thousand, six hundred forty-seven".