78355388 has 12 divisors (see below), whose sum is σ = 143083920. Its totient is φ = 37474272.

The previous prime is 78355349. The next prime is 78355391. The reversal of 78355388 is 88355387.

It is a super-2 number, since 2×78355388² = 12279133657261088, which contains 22 as substring.

It is a congruent number.

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, 425753 + ... + 425936.

It is an arithmetic number, because the mean of its divisors is an integer number (11923660).

Almost surely, 2^78355388 is an apocalyptic number.

It is an amenable number.

78355388 is a deficient number, since it is larger than the sum of its proper divisors (64728532).

78355388 is a wasteful number, since it uses less digits than its factorization.

78355388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851716 (or 851714 counting only the distinct ones).

The product of its digits is 806400, while the sum is 47.

The square root of 78355388 is about 8851.8578840829. The cubic root of 78355388 is about 427.9137960722.

Subtracting 78355388 from its reverse (88355387), we obtain a palindrome (9999999).

The spelling of 78355388 in words is "seventy-eight million, three hundred fifty-five thousand, three hundred eighty-eight".