71221650 has 24 divisors (see below), whose sum is σ = 176630064. Its totient is φ = 18992400.

The previous prime is 71221649. The next prime is 71221669. The reversal of 71221650 is 5612217.

It is a self number, because there is not a number n which added to its sum of digits gives 71221650.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 237256 + ... + 237555.

It is an arithmetic number, because the mean of its divisors is an integer number (7359586).

Almost surely, 2^71221650 is an apocalyptic number.

71221650 is an abundant number, since it is smaller than the sum of its proper divisors (105408414).

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

71221650 is a wasteful number, since it uses less digits than its factorization.

71221650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474826 (or 474821 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 71221650 is about 8439.2920319183. The cubic root of 71221650 is about 414.5122250936.

Adding to 71221650 its reverse (5612217), we get a palindrome (76833867).

The spelling of 71221650 in words is "seventy-one million, two hundred twenty-one thousand, six hundred fifty".