212817078 has 16 divisors (see below), whose sum is σ = 472926960. Its totient is φ = 70939008.

The previous prime is 212817053. The next prime is 212817079. The reversal of 212817078 is 870718212.

It is a happy number.

It is a super-2 number, since 2×212817078² = 90582217376916168, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212817079) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1970475 + ... + 1970582.

It is an arithmetic number, because the mean of its divisors is an integer number (29557935).

Almost surely, 2^212817078 is an apocalyptic number.

212817078 is an abundant number, since it is smaller than the sum of its proper divisors (260109882).

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

212817078 is a wasteful number, since it uses less digits than its factorization.

212817078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3941068 (or 3941062 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 36.

The square root of 212817078 is about 14588.2513688242. The cubic root of 212817078 is about 597.0382541584.

The spelling of 212817078 in words is "two hundred twelve million, eight hundred seventeen thousand, seventy-eight".