78724238 has 8 divisors (see below), whose sum is σ = 119413440. Its totient is φ = 38919760.

The previous prime is 78724213. The next prime is 78724249. The reversal of 78724238 is 83242787.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 78724195 and 78724204.

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 in 3 ways as a sum of consecutive naturals, for example, 220958 + ... + 221313.

It is an arithmetic number, because the mean of its divisors is an integer number (14926680).

Almost surely, 2^78724238 is an apocalyptic number.

78724238 is a deficient number, since it is larger than the sum of its proper divisors (40689202).

78724238 is a wasteful number, since it uses less digits than its factorization.

78724238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442362.

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

The square root of 78724238 is about 8872.6680316577. The cubic root of 78724238 is about 428.5841987412.

The spelling of 78724238 in words is "seventy-eight million, seven hundred twenty-four thousand, two hundred thirty-eight".