212278716 has 72 divisors (see below), whose sum is σ = 608309520. Its totient is φ = 61876224.

The previous prime is 212278709. The next prime is 212278721. The reversal of 212278716 is 617872212.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3045 + ... + 20828.

Almost surely, 2^212278716 is an apocalyptic number.

212278716 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212278716, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (304154760).

212278716 is an abundant number, since it is smaller than the sum of its proper divisors (396030804).

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

212278716 is a wasteful number, since it uses less digits than its factorization.

212278716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23915 (or 23910 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 212278716 is about 14569.7877815705. The cubic root of 212278716 is about 596.5343877601.

The spelling of 212278716 in words is "two hundred twelve million, two hundred seventy-eight thousand, seven hundred sixteen".