71040420 has 72 divisors (see below), whose sum is σ = 235085760. Its totient is φ = 17221440.

The previous prime is 71040419. The next prime is 71040451. The reversal of 71040420 is 2404017.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 71040393 and 71040402.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15960 + ... + 19919.

It is an arithmetic number, because the mean of its divisors is an integer number (3265080).

Almost surely, 2^71040420 is an apocalyptic number.

It is an amenable number.

71040420 is an abundant number, since it is smaller than the sum of its proper divisors (164045340).

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

71040420 is a wasteful number, since it uses less digits than its factorization.

71040420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35905 (or 35900 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 71040420 is about 8428.5479176428. The cubic root of 71040420 is about 414.1603383705.

Adding to 71040420 its reverse (2404017), we get a palindrome (73444437).

The spelling of 71040420 in words is "seventy-one million, forty thousand, four hundred twenty".