78617947 has 8 divisors (see below), whose sum is σ = 79698960. Its totient is φ = 77544480.

The previous prime is 78617941. The next prime is 78617963. The reversal of 78617947 is 74971687.

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 78617947 - 2³ = 78617939 is a prime.

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 78617947.

It is not an unprimeable number, because it can be changed into a prime (78617941) 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 7 ways as a sum of consecutive naturals, for example, 20929 + ... + 24397.

It is an arithmetic number, because the mean of its divisors is an integer number (9962370).

Almost surely, 2^78617947 is an apocalyptic number.

78617947 is a deficient number, since it is larger than the sum of its proper divisors (1081013).

78617947 is a wasteful number, since it uses less digits than its factorization.

78617947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3773.

The product of its digits is 592704, while the sum is 49.

The square root of 78617947 is about 8866.6762092680. The cubic root of 78617947 is about 428.3912248796.

The spelling of 78617947 in words is "seventy-eight million, six hundred seventeen thousand, nine hundred forty-seven".