71222740 has 24 divisors (see below), whose sum is σ = 153217512. Its totient is φ = 27793920.

The previous prime is 71222737. The next prime is 71222747. The reversal of 71222740 is 4722217.

It can be written as a sum of positive squares in 4 ways, for example, as 56644 + 71166096 = 238^2 + 8436^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71222747) 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, 42609 + ... + 44248.

It is an arithmetic number, because the mean of its divisors is an integer number (6384063).

Almost surely, 2^71222740 is an apocalyptic number.

It is an amenable number.

71222740 is an abundant number, since it is smaller than the sum of its proper divisors (81994772).

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

71222740 is a wasteful number, since it uses less digits than its factorization.

71222740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86907 (or 86905 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 25.

The square root of 71222740 is about 8439.3566105480. The cubic root of 71222740 is about 414.5143396941.

Adding to 71222740 its reverse (4722217), we get a palindrome (75944957).

The spelling of 71222740 in words is "seventy-one million, two hundred twenty-two thousand, seven hundred forty".