78824231 has 4 divisors (see below), whose sum is σ = 79224552. Its totient is φ = 78423912.

The previous prime is 78824219. The next prime is 78824267. The reversal of 78824231 is 13242887.

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

It is a cyclic number.

It is not a de Polignac number, because 78824231 - 2¹⁰ = 78823207 is a prime.

It is a super-2 number, since 2×78824231² = 12426518785482722, which contains 22 as substring.

It is a Duffinian number.

78824231 is a modest number, since divided by 24231 gives 788 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 78824191 and 78824200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78824281) 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 3 ways as a sum of consecutive naturals, for example, 199865 + ... + 200258.

It is an arithmetic number, because the mean of its divisors is an integer number (19806138).

Almost surely, 2^78824231 is an apocalyptic number.

78824231 is a deficient number, since it is larger than the sum of its proper divisors (400321).

78824231 is a wasteful number, since it uses less digits than its factorization.

78824231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400320.

The product of its digits is 21504, while the sum is 35.

The square root of 78824231 is about 8878.3011325366. The cubic root of 78824231 is about 428.7655799318.

The spelling of 78824231 in words is "seventy-eight million, eight hundred twenty-four thousand, two hundred thirty-one".