78783375 has 64 divisors (see below), whose sum is σ = 145566720. Its totient is φ = 37520000.

The previous prime is 78783359. The next prime is 78783377. The reversal of 78783375 is 57338787.

It is a Cunningham number, because it is equal to 8876²-1.

It is not a de Polignac number, because 78783375 - 2⁴ = 78783359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78783377) by changing a digit.

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 in 63 ways as a sum of consecutive naturals, for example, 292741 + ... + 293009.

It is an arithmetic number, because the mean of its divisors is an integer number (2274480).

Almost surely, 2^78783375 is an apocalyptic number.

78783375 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

78783375 is a deficient number, since it is larger than the sum of its proper divisors (66783345).

78783375 is a wasteful number, since it uses less digits than its factorization.

78783375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369 (or 359 counting only the distinct ones).

The product of its digits is 987840, while the sum is 48.

The square root of 78783375 is about 8875.9999436683. Note that the first 4 decimals coincide. The cubic root of 78783375 is about 428.6914881889.

The spelling of 78783375 in words is "seventy-eight million, seven hundred eighty-three thousand, three hundred seventy-five".