71405280 has 96 divisors (see below), whose sum is σ = 249933600. Its totient is φ = 19040256.

The previous prime is 71405261. The next prime is 71405293. The reversal of 71405280 is 8250417.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3945 + ... + 12584.

It is an arithmetic number, because the mean of its divisors is an integer number (2603475).

Almost surely, 2^71405280 is an apocalyptic number.

It is an amenable number.

71405280 is an abundant number, since it is smaller than the sum of its proper divisors (178528320).

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

71405280 is a wasteful number, since it uses less digits than its factorization.

71405280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16553 (or 16539 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 71405280 is about 8450.1644954403. The cubic root of 71405280 is about 414.8681634743.

Adding to 71405280 its reverse (8250417), we get a palindrome (79655697).

The spelling of 71405280 in words is "seventy-one million, four hundred five thousand, two hundred eighty".