213227878 has 4 divisors (see below), whose sum is σ = 319841820. Its totient is φ = 106613938.

The previous prime is 213227849. The next prime is 213227881. The reversal of 213227878 is 878722312.

213227878 is nontrivially palindromic in base 9.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×213227878² = 90932255912765768, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 213227878.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53306968 + ... + 53306971.

It is an arithmetic number, because the mean of its divisors is an integer number (79960455).

Almost surely, 2^213227878 is an apocalyptic number.

213227878 is a deficient number, since it is larger than the sum of its proper divisors (106613942).

213227878 is a wasteful number, since it uses less digits than its factorization.

213227878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106613941.

The product of its digits is 75264, while the sum is 40.

The square root of 213227878 is about 14602.3244040118. The cubic root of 213227878 is about 597.4221608070.

The spelling of 213227878 in words is "two hundred thirteen million, two hundred twenty-seven thousand, eight hundred seventy-eight".