78888947 has 4 divisors (see below), whose sum is σ = 79072416. Its totient is φ = 78705480.

The previous prime is 78888941. The next prime is 78888967. The reversal of 78888947 is 74988887.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78888947 - 2¹⁸ = 78626803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78888941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91088 + ... + 91949.

It is an arithmetic number, because the mean of its divisors is an integer number (19768104).

Almost surely, 2^78888947 is an apocalyptic number.

78888947 is a deficient number, since it is larger than the sum of its proper divisors (183469).

78888947 is a wasteful number, since it uses less digits than its factorization.

78888947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183468.

The product of its digits is 7225344, while the sum is 59.

The square root of 78888947 is about 8881.9450009556. The cubic root of 78888947 is about 428.8828890491.

The spelling of 78888947 in words is "seventy-eight million, eight hundred eighty-eight thousand, nine hundred forty-seven".