71331240 has 32 divisors (see below), whose sum is σ = 213994080. Its totient is φ = 19021632.

The previous prime is 71331209. The next prime is 71331241. The reversal of 71331240 is 4213317.

It is not an unprimeable number, because it can be changed into a prime (71331241) 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, 297094 + ... + 297333.

It is an arithmetic number, because the mean of its divisors is an integer number (6687315).

Almost surely, 2^71331240 is an apocalyptic number.

It is an amenable number.

71331240 is an abundant number, since it is smaller than the sum of its proper divisors (142662840).

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

71331240 is a wasteful number, since it uses less digits than its factorization.

71331240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594441 (or 594437 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 71331240 is about 8445.7823793891. The cubic root of 71331240 is about 414.7247218797.

Adding to 71331240 its reverse (4213317), we get a palindrome (75544557).

The spelling of 71331240 in words is "seventy-one million, three hundred thirty-one thousand, two hundred forty".