78947738 has 4 divisors (see below), whose sum is σ = 118421610. Its totient is φ = 39473868.

The previous prime is 78947689. The next prime is 78947741. The reversal of 78947738 is 83774987.

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

It can be written as a sum of positive squares in only one way, i.e., 49603849 + 29343889 = 7043^2 + 5417^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78947738.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19736933 + ... + 19736936.

Almost surely, 2^78947738 is an apocalyptic number.

78947738 is a deficient number, since it is larger than the sum of its proper divisors (39473872).

78947738 is a wasteful number, since it uses less digits than its factorization.

78947738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39473871.

The product of its digits is 2370816, while the sum is 53.

The square root of 78947738 is about 8885.2539637311. The cubic root of 78947738 is about 428.9894024619.

The spelling of 78947738 in words is "seventy-eight million, nine hundred forty-seven thousand, seven hundred thirty-eight".