71213440 has 32 divisors (see below), whose sum is σ = 170246160. Its totient is φ = 28485120.

The previous prime is 71213437. The next prime is 71213477. The reversal of 71213440 is 4431217.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54996 + ... + 56275.

Almost surely, 2^71213440 is an apocalyptic number.

It is an amenable number.

71213440 is an abundant number, since it is smaller than the sum of its proper divisors (99032720).

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

71213440 is a wasteful number, since it uses less digits than its factorization.

71213440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111290 (or 111278 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 71213440 is about 8438.8056026905. The cubic root of 71213440 is about 414.4962969962.

Adding to 71213440 its reverse (4431217), we get a palindrome (75644657).

The spelling of 71213440 in words is "seventy-one million, two hundred thirteen thousand, four hundred forty".