78565738 has 8 divisors (see below), whose sum is σ = 124780932. Its totient is φ = 36972096.

The previous prime is 78565709. The next prime is 78565777. The reversal of 78565738 is 83756587.

It can be written as a sum of positive squares in 2 ways, for example, as 69939769 + 8625969 = 8363^2 + 2937^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 78565691 and 78565700.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1155345 + ... + 1155412.

Almost surely, 2^78565738 is an apocalyptic number.

78565738 is a deficient number, since it is larger than the sum of its proper divisors (46215194).

78565738 is a wasteful number, since it uses less digits than its factorization.

78565738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2310776.

The product of its digits is 1411200, while the sum is 49.

The square root of 78565738 is about 8863.7316069475. The cubic root of 78565738 is about 428.2963744836.

The spelling of 78565738 in words is "seventy-eight million, five hundred sixty-five thousand, seven hundred thirty-eight".