71423280 has 240 divisors, whose sum is σ = 264625920. Its totient is φ = 17183232.

The previous prime is 71423279. The next prime is 71423281. The reversal of 71423280 is 8232417.

It is an interprime number because it is at equal distance from previous prime (71423279) and next prime (71423281).

It is a tau number, because it is divible by the number of its divisors (240).

It is not an unprimeable number, because it can be changed into a prime (71423281) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 314527 + ... + 314753.

It is an arithmetic number, because the mean of its divisors is an integer number (1102608).

Almost surely, 2^71423280 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71423280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132312960).

71423280 is an abundant number, since it is smaller than the sum of its proper divisors (193202640).

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

71423280 is a wasteful number, since it uses less digits than its factorization.

71423280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288 (or 279 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 71423280 is about 8451.2294963514. The cubic root of 71423280 is about 414.9030208385.

Adding to 71423280 its reverse (8232417), we get a palindrome (79655697).

The spelling of 71423280 in words is "seventy-one million, four hundred twenty-three thousand, two hundred eighty".