213884778 has 8 divisors (see below), whose sum is σ = 427769568. Its totient is φ = 71294924.

The previous prime is 213884777. The next prime is 213884807. The reversal of 213884778 is 877488312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

213884778 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (213884777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17823726 + ... + 17823737.

It is an arithmetic number, because the mean of its divisors is an integer number (53471196).

Almost surely, 2^213884778 is an apocalyptic number.

213884778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213884778 is a wasteful number, since it uses less digits than its factorization.

213884778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35647468.

The product of its digits is 602112, while the sum is 48.

The square root of 213884778 is about 14624.8001011980. The cubic root of 213884778 is about 598.0350329770.

The spelling of 213884778 in words is "two hundred thirteen million, eight hundred eighty-four thousand, seven hundred seventy-eight".