78242331 has 4 divisors (see below), whose sum is σ = 104323112. Its totient is φ = 52161552.

The previous prime is 78242317. The next prime is 78242341. The reversal of 78242331 is 13324287.

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

It is not a de Polignac number, because 78242331 - 2⁶ = 78242267 is a prime.

It is a super-2 number, since 2×78242331² = 12243724720627122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78242341) 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, 13040386 + ... + 13040391.

It is an arithmetic number, because the mean of its divisors is an integer number (26080778).

Almost surely, 2^78242331 is an apocalyptic number.

78242331 is a deficient number, since it is larger than the sum of its proper divisors (26080781).

78242331 is a wasteful number, since it uses less digits than its factorization.

78242331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26080780.

The product of its digits is 8064, while the sum is 30.

The square root of 78242331 is about 8845.4695183467. The cubic root of 78242331 is about 427.7078883567.

The spelling of 78242331 in words is "seventy-eight million, two hundred forty-two thousand, three hundred thirty-one".