78662947 has 6 divisors (see below), whose sum is σ = 86464364. Its totient is φ = 71511660.

The previous prime is 78662939. The next prime is 78663017. The reversal of 78662947 is 74926687.

It is not a de Polignac number, because 78662947 - 2³ = 78662939 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 78662947.

It is not an unprimeable number, because it can be changed into a prime (78662347) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 324933 + ... + 325174.

Almost surely, 2^78662947 is an apocalyptic number.

78662947 is a deficient number, since it is larger than the sum of its proper divisors (7801417).

78662947 is a wasteful number, since it uses less digits than its factorization.

78662947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650129 (or 650118 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 49.

The square root of 78662947 is about 8869.2134375039. The cubic root of 78662947 is about 428.4729446774.

The spelling of 78662947 in words is "seventy-eight million, six hundred sixty-two thousand, nine hundred forty-seven".