71231280 has 40 divisors (see below), whose sum is σ = 220817712. Its totient is φ = 18994944.

The previous prime is 71231267. The next prime is 71231287. The reversal of 71231280 is 8213217.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 71231280.

It is not an unprimeable number, because it can be changed into a prime (71231287) 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, 148159 + ... + 148638.

Almost surely, 2^71231280 is an apocalyptic number.

It is an amenable number.

71231280 is an abundant number, since it is smaller than the sum of its proper divisors (149586432).

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

71231280 is a wasteful number, since it uses less digits than its factorization.

71231280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296813 (or 296807 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 71231280 is about 8439.8625581226. The cubic root of 71231280 is about 414.5309065518.

Adding to 71231280 its reverse (8213217), we get a palindrome (79444497).

The spelling of 71231280 in words is "seventy-one million, two hundred thirty-one thousand, two hundred eighty".