71220340 has 24 divisors (see below), whose sum is σ = 152386920. Its totient is φ = 27950208.

The previous prime is 71220337. The next prime is 71220343. The reversal of 71220340 is 4302217.

It is an interprime number because it is at equal distance from previous prime (71220337) and next prime (71220343).

It can be written as a sum of positive squares in 4 ways, for example, as 31832164 + 39388176 = 5642^2 + 6276^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71220343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32535 + ... + 34654.

It is an arithmetic number, because the mean of its divisors is an integer number (6349455).

Almost surely, 2^71220340 is an apocalyptic number.

It is an amenable number.

71220340 is an abundant number, since it is smaller than the sum of its proper divisors (81166580).

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

71220340 is a wasteful number, since it uses less digits than its factorization.

71220340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67251 (or 67249 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 71220340 is about 8439.2144184160. The cubic root of 71220340 is about 414.5096836644.

Adding to 71220340 its reverse (4302217), we get a palindrome (75522557).

The spelling of 71220340 in words is "seventy-one million, two hundred twenty thousand, three hundred forty".