78243071 has 4 divisors (see below), whose sum is σ = 78444600. Its totient is φ = 78041544.

The previous prime is 78243059. The next prime is 78243089. The reversal of 78243071 is 17034287.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17034287 = 2963 ⋅5749.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78243071 is a prime.

It is a super-2 number, since 2×78243071² = 12243956319022082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78245071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100181 + ... + 100958.

It is an arithmetic number, because the mean of its divisors is an integer number (19611150).

Almost surely, 2^78243071 is an apocalyptic number.

78243071 is a deficient number, since it is larger than the sum of its proper divisors (201529).

78243071 is a wasteful number, since it uses less digits than its factorization.

78243071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201528.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 78243071 is about 8845.5113475706. The cubic root of 78243071 is about 427.7092367438.

The spelling of 78243071 in words is "seventy-eight million, two hundred forty-three thousand, seventy-one".