78223142 has 4 divisors (see below), whose sum is σ = 117334716. Its totient is φ = 39111570.

The previous prime is 78223141. The next prime is 78223151. The reversal of 78223142 is 24132287.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24132287 = 773 ⋅31219.

It is a super-2 number, since 2×78223142² = 12237719888704328, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78223141) 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 as a sum of consecutive naturals, namely, 19555784 + ... + 19555787.

It is an arithmetic number, because the mean of its divisors is an integer number (29333679).

Almost surely, 2^78223142 is an apocalyptic number.

78223142 is a deficient number, since it is larger than the sum of its proper divisors (39111574).

78223142 is a wasteful number, since it uses less digits than its factorization.

78223142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39111573.

The product of its digits is 5376, while the sum is 29.

The square root of 78223142 is about 8844.3847722722. The cubic root of 78223142 is about 427.6729202536.

The spelling of 78223142 in words is "seventy-eight million, two hundred twenty-three thousand, one hundred forty-two".