78742238 has 4 divisors (see below), whose sum is σ = 118113360. Its totient is φ = 39371118.

The previous prime is 78742211. The next prime is 78742241. The reversal of 78742238 is 83224787.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78742195 and 78742204.

It is a congruent number.

It is an unprimeable number.

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, 19685558 + ... + 19685561.

It is an arithmetic number, because the mean of its divisors is an integer number (29528340).

Almost surely, 2^78742238 is an apocalyptic number.

78742238 is a deficient number, since it is larger than the sum of its proper divisors (39371122).

78742238 is a wasteful number, since it uses less digits than its factorization.

78742238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39371121.

The product of its digits is 150528, while the sum is 41.

The square root of 78742238 is about 8873.6823247173. The cubic root of 78742238 is about 428.6168609719.

The spelling of 78742238 in words is "seventy-eight million, seven hundred forty-two thousand, two hundred thirty-eight".