78388 has 6 divisors (see below), whose sum is σ = 137186. Its totient is φ = 39192.

The previous prime is 78367. The next prime is 78401. The reversal of 78388 is 88387.

It can be written as a sum of positive squares in only one way, i.e., 63504 + 14884 = 252^2 + 122^2 .

It is a super-2 number, since 2×78388² = 12289357088, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9795 + ... + 9802.

2⁷⁸³⁸⁸ is an apocalyptic number.

It is an amenable number.

78388 is a deficient number, since it is larger than the sum of its proper divisors (58798).

78388 is a wasteful number, since it uses less digits than its factorization.

78388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19601 (or 19599 counting only the distinct ones).

The product of its digits is 10752, while the sum is 34.

The square root of 78388 is about 279.9785706085. The cubic root of 78388 is about 42.7973154633.

Subtracting 78388 from its reverse (88387), we obtain a palindrome (9999).

The spelling of 78388 in words is "seventy-eight thousand, three hundred eighty-eight".