70217220 has 48 divisors (see below), whose sum is σ = 198571968. Its totient is φ = 18537600.

The previous prime is 70217197. The next prime is 70217221. The reversal of 70217220 is 2271207.

It is not an unprimeable number, because it can be changed into a prime (70217221) 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, 267 + ... + 11853.

It is an arithmetic number, because the mean of its divisors is an integer number (4136916).

Almost surely, 2^70217220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 70217220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99285984).

70217220 is an abundant number, since it is smaller than the sum of its proper divisors (128354748).

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

70217220 is a wasteful number, since it uses less digits than its factorization.

70217220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11700 (or 11698 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 21.

The square root of 70217220 is about 8379.5715880945. The cubic root of 70217220 is about 412.5543876864.

Adding to 70217220 its reverse (2271207), we get a palindrome (72488427).

It can be divided in two parts, 7021 and 7220, that added together give a palindrome (14241).

The spelling of 70217220 in words is "seventy million, two hundred seventeen thousand, two hundred twenty".