2217870729 has 24 divisors (see below), whose sum is σ = 3318648840. Its totient is φ = 1425618432.

The previous prime is 2217870713. The next prime is 2217870731. The reversal of 2217870729 is 9270787122.

It can be written as a sum of positive squares in 4 ways, for example, as 3980025 + 2213890704 = 1995^2 + 47052^2 .

It is not a de Polignac number, because 2217870729 - 2⁴ = 2217870713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2217870709) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 196257 + ... + 207249.

It is an arithmetic number, because the mean of its divisors is an integer number (138277035).

Almost surely, 2^2217870729 is an apocalyptic number.

2217870729 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2217870729 is a deficient number, since it is larger than the sum of its proper divisors (1100778111).

2217870729 is a wasteful number, since it uses less digits than its factorization.

2217870729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11801 (or 11798 counting only the distinct ones).

The product of its (nonzero) digits is 197568, while the sum is 45.

The square root of 2217870729 is about 47094.2749068292. The cubic root of 2217870729 is about 1304.1035478091.

The spelling of 2217870729 in words is "two billion, two hundred seventeen million, eight hundred seventy thousand, seven hundred twenty-nine".