78120211 has 16 divisors (see below), whose sum is σ = 87127488. Its totient is φ = 69580800.

The previous prime is 78120197. The next prime is 78120233. The reversal of 78120211 is 11202187.

It is a cyclic number.

It is not a de Polignac number, because 78120211 - 2⁵ = 78120179 is a prime.

It is a super-2 number, since 2×78120211² = 12205534733369042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78120241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50946 + ... + 52456.

It is an arithmetic number, because the mean of its divisors is an integer number (5445468).

Almost surely, 2^78120211 is an apocalyptic number.

78120211 is a deficient number, since it is larger than the sum of its proper divisors (9007277).

78120211 is a wasteful number, since it uses less digits than its factorization.

78120211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1662.

The product of its (nonzero) digits is 224, while the sum is 22.

The square root of 78120211 is about 8838.5638539301. The cubic root of 78120211 is about 427.4852514776.

Adding to 78120211 its reverse (11202187), we get a palindrome (89322398).

It can be divided in two parts, 7 and 8120211, that added together give a palindrome (8120218).

The spelling of 78120211 in words is "seventy-eight million, one hundred twenty thousand, two hundred eleven".