71222290 has 16 divisors (see below), whose sum is σ = 128296512. Its totient is φ = 28467504.

The previous prime is 71222269. The next prime is 71222309. The reversal of 71222290 is 9222217.

It is a super-2 number, since 2×71222290² = 10145229185688200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23227 + ... + 26113.

It is an arithmetic number, because the mean of its divisors is an integer number (8018532).

Almost surely, 2^71222290 is an apocalyptic number.

71222290 is a deficient number, since it is larger than the sum of its proper divisors (57074222).

71222290 is a wasteful number, since it uses less digits than its factorization.

71222290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5361.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 71222290 is about 8439.3299497057. The cubic root of 71222290 is about 414.5134666965.

The spelling of 71222290 in words is "seventy-one million, two hundred twenty-two thousand, two hundred ninety".