78243211 has 8 divisors (see below), whose sum is σ = 81666144. Its totient is φ = 74892480.

The previous prime is 78243181. The next prime is 78243241. The reversal of 78243211 is 11234287.

It is an interprime number because it is at equal distance from previous prime (78243181) and next prime (78243241).

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 78243211 - 2¹³ = 78235019 is a prime.

It is a super-2 number, since 2×78243211² = 12244000135181042, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78243211.

It is not an unprimeable number, because it can be changed into a prime (78243241) 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, 15831 + ... + 20176.

It is an arithmetic number, because the mean of its divisors is an integer number (10208268).

Almost surely, 2^78243211 is an apocalyptic number.

78243211 is a deficient number, since it is larger than the sum of its proper divisors (3422933).

78243211 is a wasteful number, since it uses less digits than its factorization.

78243211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36101.

The product of its digits is 2688, while the sum is 28.

The square root of 78243211 is about 8845.5192611853. The cubic root of 78243211 is about 427.7094918431.

Adding to 78243211 its reverse (11234287), we get a palindrome (89477498).

The spelling of 78243211 in words is "seventy-eight million, two hundred forty-three thousand, two hundred eleven".