213816078 has 32 divisors (see below), whose sum is σ = 543025920. Its totient is φ = 61090200.

The previous prime is 213816077. The next prime is 213816079. The reversal of 213816078 is 870618312.

It is an interprime number because it is at equal distance from previous prime (213816077) and next prime (213816079).

It is a super-2 number, since 2×213816078² = 91434630422604168, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213816077) 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, 282448 + ... + 283203.

It is an arithmetic number, because the mean of its divisors is an integer number (16969560).

Almost surely, 2^213816078 is an apocalyptic number.

213816078 is an abundant number, since it is smaller than the sum of its proper divisors (329209842).

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

213816078 is a wasteful number, since it uses less digits than its factorization.

213816078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565669 (or 565663 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 213816078 is about 14622.4511625103. The cubic root of 213816078 is about 597.9709963077.

The spelling of 213816078 in words is "two hundred thirteen million, eight hundred sixteen thousand, seventy-eight".