78112211 has 4 divisors (see below), whose sum is σ = 82223400. Its totient is φ = 74001024.

The previous prime is 78112201. The next prime is 78112231. The reversal of 78112211 is 11221187.

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 78112211 - 2¹⁴ = 78095827 is a prime.

It is a super-2 number, since 2×78112211² = 12203035014617042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78112201) 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, 2055566 + ... + 2055603.

It is an arithmetic number, because the mean of its divisors is an integer number (20555850).

Almost surely, 2^78112211 is an apocalyptic number.

78112211 is a deficient number, since it is larger than the sum of its proper divisors (4111189).

78112211 is a wasteful number, since it uses less digits than its factorization.

78112211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4111188.

The product of its digits is 224, while the sum is 23.

The square root of 78112211 is about 8838.1112801322. Note that the first 3 decimals coincide. The cubic root of 78112211 is about 427.4706585883.

Adding to 78112211 its reverse (11221187), we get a palindrome (89333398).

The spelling of 78112211 in words is "seventy-eight million, one hundred twelve thousand, two hundred eleven".