71840663 has 4 divisors (see below), whose sum is σ = 71928360. Its totient is φ = 71752968.

The previous prime is 71840641. The next prime is 71840669. The reversal of 71840663 is 36604817.

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 71840663 - 2¹⁴ = 71824279 is a prime.

It is a super-2 number, since 2×71840663² = 10322161720559138, 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 (71840669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42608 + ... + 44261.

It is an arithmetic number, because the mean of its divisors is an integer number (17982090).

Almost surely, 2^71840663 is an apocalyptic number.

71840663 is a deficient number, since it is larger than the sum of its proper divisors (87697).

71840663 is an equidigital number, since it uses as much as digits as its factorization.

71840663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87696.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 71840663 is about 8475.8871512072. The cubic root of 71840663 is about 415.7096543264.

The spelling of 71840663 in words is "seventy-one million, eight hundred forty thousand, six hundred sixty-three".