78440243 has 8 divisors (see below), whose sum is σ = 89709312. Its totient is φ = 67187016.

The previous prime is 78440237. The next prime is 78440251. The reversal of 78440243 is 34204487.

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

It is a cyclic number.

It is not a de Polignac number, because 78440243 - 2⁸ = 78439987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78440203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9896 + ... + 15962.

It is an arithmetic number, because the mean of its divisors is an integer number (11213664).

Almost surely, 2^78440243 is an apocalyptic number.

78440243 is a deficient number, since it is larger than the sum of its proper divisors (11269069).

78440243 is a wasteful number, since it uses less digits than its factorization.

78440243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7921.

The product of its (nonzero) digits is 21504, while the sum is 32.

The square root of 78440243 is about 8856.6496487103. The cubic root of 78440243 is about 428.0682101525.

The spelling of 78440243 in words is "seventy-eight million, four hundred forty thousand, two hundred forty-three".