78885247 has 6 divisors (see below), whose sum is σ = 91764528. Its totient is φ = 67615884.

The previous prime is 78885241. The next prime is 78885277. The reversal of 78885247 is 74258887.

It is a de Polignac number, because none of the positive numbers 2^k-78885247 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 1609903 = 78885247 / (7 + 8 + 8 + 8 + 5 + 2 + 4 + 7).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78885247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78885241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 804903 + ... + 805000.

It is an arithmetic number, because the mean of its divisors is an integer number (15294088).

Almost surely, 2^78885247 is an apocalyptic number.

78885247 is a deficient number, since it is larger than the sum of its proper divisors (12879281).

78885247 is a wasteful number, since it uses less digits than its factorization.

78885247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1609917 (or 1609910 counting only the distinct ones).

The product of its digits is 1003520, while the sum is 49.

The square root of 78885247 is about 8881.7367108016. The cubic root of 78885247 is about 428.8761838787.

The spelling of 78885247 in words is "seventy-eight million, eight hundred eighty-five thousand, two hundred forty-seven".