71238220 has 24 divisors (see below), whose sum is σ = 157474800. Its totient is φ = 26995392.

The previous prime is 71238187. The next prime is 71238221. The reversal of 71238220 is 2283217.

It is not an unprimeable number, because it can be changed into a prime (71238221) by changing a digit.

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, 93355 + ... + 94114.

It is an arithmetic number, because the mean of its divisors is an integer number (6561450).

Almost surely, 2^71238220 is an apocalyptic number.

It is an amenable number.

71238220 is an abundant number, since it is smaller than the sum of its proper divisors (86236580).

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

71238220 is a wasteful number, since it uses less digits than its factorization.

71238220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187497 (or 187495 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 71238220 is about 8440.2736922448. The cubic root of 71238220 is about 414.5443685733.

The spelling of 71238220 in words is "seventy-one million, two hundred thirty-eight thousand, two hundred twenty".