78193775 has 12 divisors (see below), whose sum is σ = 105775224. Its totient is φ = 56868000.

The previous prime is 78193763. The next prime is 78193777. The reversal of 78193775 is 57739187.

It is not a de Polignac number, because 78193775 - 2⁶ = 78193711 is a prime.

It is a super-2 number, since 2×78193775² = 12228532897501250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78193777) 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 11 ways as a sum of consecutive naturals, for example, 141896 + ... + 142445.

It is an arithmetic number, because the mean of its divisors is an integer number (8814602).

Almost surely, 2^78193775 is an apocalyptic number.

78193775 is a deficient number, since it is larger than the sum of its proper divisors (27581449).

78193775 is a wasteful number, since it uses less digits than its factorization.

78193775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284362 (or 284357 counting only the distinct ones).

The product of its digits is 370440, while the sum is 47.

The square root of 78193775 is about 8842.7244104970. The cubic root of 78193775 is about 427.6193937124.

The spelling of 78193775 in words is "seventy-eight million, one hundred ninety-three thousand, seven hundred seventy-five".