78193446 has 16 divisors (see below), whose sum is σ = 158000304. Its totient is φ = 25795584.

The previous prime is 78193433. The next prime is 78193447. The reversal of 78193446 is 64439187.

It is a super-2 number, since 2×78193446² = 12228429994709832, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78193398 and 78193407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78193447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66595 + ... + 67758.

It is an arithmetic number, because the mean of its divisors is an integer number (9875019).

Almost surely, 2^78193446 is an apocalyptic number.

78193446 is an abundant number, since it is smaller than the sum of its proper divisors (79806858).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78193446 is a wasteful number, since it uses less digits than its factorization.

78193446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134455.

The product of its digits is 145152, while the sum is 42.

The square root of 78193446 is about 8842.7058076134. The cubic root of 78193446 is about 427.6187939759.

The spelling of 78193446 in words is "seventy-eight million, one hundred ninety-three thousand, four hundred forty-six".