70171220 has 24 divisors (see below), whose sum is σ = 168411264. Its totient is φ = 24058656.

The previous prime is 70171207. The next prime is 70171243. The reversal of 70171220 is 2217107.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 70171192 and 70171201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250472 + ... + 250751.

It is an arithmetic number, because the mean of its divisors is an integer number (7017136).

Almost surely, 2^70171220 is an apocalyptic number.

70171220 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

70171220 is an abundant number, since it is smaller than the sum of its proper divisors (98240044).

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

70171220 is a wasteful number, since it uses less digits than its factorization.

70171220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501239 (or 501237 counting only the distinct ones).

The product of its (nonzero) digits is 196, while the sum is 20.

The square root of 70171220 is about 8376.8263680227. The cubic root of 70171220 is about 412.4642785106.

Adding to 70171220 its reverse (2217107), we get a palindrome (72388327).

The spelling of 70171220 in words is "seventy million, one hundred seventy-one thousand, two hundred twenty".